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LEASES (Tables)

12 Months Ended

Dec. 31, 2019

During the year ended December 31, 2019, the components of lease expense were as follows:



	Income Statement Classification	Year Ended December 31, 2019
Operating lease cost	Selling, general and administrative expenses	$	62,740
Variable lease cost	Selling, general and administrative expenses	8,730
Short-term lease cost	Selling, general and administrative expenses	3,870
Total lease cost		$	75,340

Supplemental Cash Flow Information

Supplemental cash flow information related to leases was as follows:



	Year Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases	$	59,952
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	107,822
Non-cash net increase due to lease modifications:
Operating lease right-of-use assets	$	10,124
Operating lease liabilities	$	10,192

Weighted Average Remaining Lease Term and Discount Rate

Weighted average remaining lease term and discount rate as of December 31, 2019, were as follows:



	As of December 31, 2019
Weighted average remaining lease term, in years:
Operating leases	6.1
Weighted average discount rate:
Operating leases	3.6	%

Maturity of Operating Lease Liabilities

As of December 31, 2019, operating lease liabilities will mature as follows:



Year ending December 31,	Lease Payments
2020	$	64,667
2021	54,343
2022	36,886
2023	27,018
2024	22,603
Thereafter	58,532
Total lease payments	264,049
Less: imputed interest	(25,660		)
Total	$	238,389

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 936,552	$ 770,560
Trade receivables and contract assets, net of allowance of $2,920 and $1,557, respectively	497,716	402,337
Prepaid and other current assets	39,943	26,171
Total current assets	1,474,211	1,199,068
Property and equipment, net	165,259	102,646
Operating lease right-of-use assets	238,991	0
Intangible assets, net	56,258	57,065
Goodwill	195,043	166,832
Deferred tax assets	75,013	69,983
Other noncurrent assets	39,433	16,208
Total assets	2,244,208	1,611,802
Current liabilities
Accounts payable	7,831	7,444
Accrued compensation and benefits expenses	230,035	177,594
Accrued expenses and other current liabilities	82,476	50,253
Income taxes payable, current	9,064	27,538
Operating lease liabilities, current	57,542	0
Total current liabilities	386,948	262,829
Long-term debt	25,074	25,031
Income taxes payable, noncurrent	45,878	43,685
Operating lease liabilities, noncurrent	180,848	0
Other noncurrent liabilities	9,315	17,661
Total liabilities	648,063	349,206
Commitments and contingencies (Note 14)
Stockholders’ equity
Common stock, $0.001 par value; 160,000,000 authorized; 55,207,446 and 54,099,927 shares issued, 55,187,711 and 54,080,192 shares outstanding at December 31, 2019 and December 31, 2018, respectively	55	54
Additional paid-in capital	607,051	544,700
Retained earnings	1,020,590	759,533
Treasury stock	(177)	(177)
Accumulated other comprehensive loss	(31,374)	(41,514)
Total stockholders’ equity	1,596,145	1,262,596
Total liabilities and stockholders’ equity	$ 2,244,208	$ 1,611,802

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Common Stock Restricted Stock	Common Stock Restricted Stock Units (RSUs)	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss)/ Income
Balance, beginning of period at Dec. 31, 2016	$ 781,412	$ 50			$ 374,907	$ 444,320		$ (37,688)
Balance, beginning of period (in shares) at Dec. 31, 2016		51,097,687
Treasury stock, beginning of period at Dec. 31, 2016							$ (177)
Treasury stock, beginning of period (in shares) at Dec. 31, 2016							19,735
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	48,173				48,173
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures [Abstract]
Stock units vested (in shares)				140,043
Stock units withheld for employee taxes	(3,300)				(3,300)
Stock units withheld for employee taxes (in shares)				(43,479)
Proceeds from stock option exercises	54,097	$ 3			54,094
Proceeds from stock options exercises (in shares)		1,789,434
Foreign currency translation adjustments	20,065							20,065
Foreign currency translation adjustments, net of tax	20,065
Change in unrealized gains and losses on cash flow hedges, net of tax	0
Cumulative effect of the adoption of ASU \| ASU 2016-09	1,740					1,740
Net income	72,760					72,760
Balance, end of period at Dec. 31, 2017	974,947	$ 53			473,874	518,820		(17,623)
Balance, end of period (in shares) at Dec. 31, 2017		52,983,685
Treasury stock, end of period at Dec. 31, 2017							$ (177)
Treasury stock, end of period (in shares) at Dec. 31, 2017							19,735
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	44,279				44,279
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures [Abstract]
Stock units vested (in shares)				222,675
Stock units withheld for employee taxes	(8,131)				(8,131)
Stock units withheld for employee taxes (in shares)				(71,334)
Proceeds from stock option exercises	34,679	$ 1			34,678
Proceeds from stock options exercises (in shares)		945,166
Foreign currency translation adjustments, net of tax	(21,338)							(21,338)
Change in unrealized gains and losses on cash flow hedges, net of tax	(2,553)							(2,553)
Cumulative effect of the adoption of ASU \| ASU 2014-09	457					457
Net income	240,256					240,256
Balance, end of period at Dec. 31, 2018	$ 1,262,596	$ 54			544,700	759,533		(41,514)
Balance, end of period (in shares) at Dec. 31, 2018	54,080,192	54,080,192
Treasury stock, end of period at Dec. 31, 2018							$ (177)
Treasury stock, end of period (in shares) at Dec. 31, 2018							19,735
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 41,256				41,256
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures [Abstract]
Stock issued in connection with acquisitions (in shares)			18,787
Stock units vested (in shares)				284,922
Stock units withheld for employee taxes	(15,951)				(15,951)
Stock units withheld for employee taxes (in shares)				(95,223)
Proceeds from stock option exercises	37,047	$ 1			37,046
Proceeds from stock options exercises (in shares)		899,033
Foreign currency translation adjustments, net of tax	6,295							6,295
Change in unrealized gains and losses on cash flow hedges, net of tax	3,845							3,845
Net income	261,057					261,057
Balance, end of period at Dec. 31, 2019	$ 1,596,145	$ 55			$ 607,051	$ 1,020,590		$ (31,374)
Balance, end of period (in shares) at Dec. 31, 2019	55,187,711	55,187,711
Treasury stock, end of period at Dec. 31, 2019							$ (177)
Treasury stock, end of period (in shares) at Dec. 31, 2019							19,735

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Risks and Uncertainties) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Total cash	$ 937,688	$ 771,711	$ 582,855	$ 364,664
Belarus, Russia, Ukraine, Kazakhstan, Armenia and Uzbekistan \| Geographic Concentration Risk \| Total Cash
Concentration Risk [Line Items]
Total cash	206,485
Belarus \| Geographic Concentration Risk \| Total Cash
Concentration Risk [Line Items]
Total cash	$ 123,370

LEASES (Components of Lease Expenses) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Lease, Cost [Line Items]
Total lease cost	$ 75,340
Selling, General and Administrative Expenses
Lease, Cost [Line Items]
Operating lease cost	62,740
Variable lease cost	8,730
Short-term lease cost	$ 3,870

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

EPAM Systems, Inc. (the “Company” or “EPAM”) is a leading global provider of digital platform engineering and software development services to customers located around the world, primarily in North America, Europe, Asia and Australia. The Company’s industry expertise includes financial services, travel and consumer, software and hi-tech, business information and media, life sciences and healthcare, as well as other emerging industries. The Company is incorporated in Delaware with headquarters in Newtown, Pennsylvania.

Principles of Consolidation — The consolidated financial statements include the financial statements of EPAM and its subsidiaries. All intercompany balances and transactions have been eliminated.

Reclassifications — Certain amounts recorded in the prior-period consolidated balance sheets and consolidated statements of cash flows presented have been reclassified to conform to the current-period financial statement presentation. These reclassifications had no effect on previously reported results of operations.

The Company made the following reclassifications to its consolidated balance sheet as of December 31, 2018:


•	The Company combined previously reported Accounts receivable and Unbilled revenues into Trade receivables and contract assets.


•	Amounts previously reported within Accrued expenses and other current liabilities, Due to employees, Deferred compensation due to employees and Taxes payable, current were reclassified to Accrued compensation and benefits expenses.


•	Amounts previously reported within Taxes payable, current were reclassified to Accrued expenses and other current liabilities, Accrued compensation and benefits expenses and Income taxes payable, current.

The following table summarizes the impact of these changes on the consolidated balance sheet as of December 31, 2018:



	As of December 31, 2018
	As Previously Reported		Change			As Reported
Current assets
Accounts receivable, net of allowance of $1,557	$	297,685	$	(297,685	)	$	—
Unbilled revenues	$	104,652	$	(104,652	)	$	—
Trade receivables and contract assets, net of allowance of $1,557	$	—	$	402,337		$	402,337
Current liabilities
Accrued expenses and other current liabilities	$	127,937	$	(77,684	)	$	50,253
Accrued compensation and benefits expenses	$	—	$	177,594		$	177,594
Due to employees	$	49,683	$	(49,683	)	$	—
Deferred compensation due to employees	$	9,920	$	(9,920	)	$	—
Taxes payable, current	$	67,845	$	(67,845	)	$	—
Income taxes payable, current	$	—	$	27,538		$	27,538

Use of Estimates — The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions. These estimates and assumptions affect reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as revenues and expenses during the reporting period. The Company bases its estimates and judgments on historical experience, knowledge of current conditions and its beliefs of what could occur in the future, given available information. Actual results could differ from those estimates, and such differences may be material to the financial statements.

Cash and Cash Equivalents — Cash equivalents are short-term, highly liquid investments that are readily convertible into cash, with maturities of three months or less at the date acquired.

Trade Receivables and Contract Assets — The Company classifies its right to consideration in exchange for deliverables as either a trade receivable or a contract asset. A trade receivable is a right to consideration that is unconditional (i.e., only the passage of time is required before payment is due) regardless of whether the amounts have been billed. Trade receivables are stated net of allowance for doubtful accounts. Outstanding trade receivables are reviewed periodically and allowances are provided for the estimated amount of receivables that may not be collected. The allowance for doubtful accounts is determined based on historical experience and management’s evaluation of trade receivables. A contract asset is a right to consideration that is conditional upon factors other than the passage of time. Contract assets primarily relate to unbilled amounts on fixed-price contracts. Contract assets are recorded when services have been provided but the Company does not have an unconditional right to receive consideration. The Company recognizes an impairment loss when the contract carrying amount is greater than the remaining consideration receivable, less directly related costs to be incurred.

Property and Equipment — Property and equipment acquired in the ordinary course of the Company’s operations are stated at cost, net of accumulated depreciation. Depreciation is calculated on a straight-line basis over the estimated useful lives of the assets generally ranging from two to fifty years. Leasehold improvements are amortized on a straight-line basis over the shorter of the term of the lease or the estimated useful life of the improvement. Maintenance and repairs are expensed as incurred.

Business Combinations — The Company accounts for business combinations using the acquisition method which requires it to estimate the fair value of identifiable assets acquired and liabilities assumed, including any contingent consideration, to properly allocate the purchase price to the individual assets acquired and liabilities assumed in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 805, Business Combinations. The allocation of the purchase price utilizes significant estimates in determining the fair values of identifiable assets acquired and liabilities assumed, especially with respect to intangible assets. The significant estimates and assumptions used include the timing and amount of forecasted revenues and cash flows, anticipated growth rates, client attrition rates, the discount rate reflecting the risk inherent in future cash flows and the determination of useful lives for finite-lived assets. There are different valuation models for each component, the selection of which requires considerable judgment. These determinations will affect the amount of amortization expense recognized in future periods. The Company bases its fair value estimates on assumptions it believes are reasonable, but recognizes that the assumptions are inherently uncertain. The acquired assets typically include customer relationships, software, trade names, non-competition agreements, and assembled workforce and as a result, a substantial portion of the purchase price is allocated to goodwill and other intangible assets.

If the initial accounting for the business combination has not been completed by the end of the reporting period in which the business combination occurs, provisional amounts are reported to present information about facts and circumstances that existed as of the acquisition date. Once the measurement period ends, which in no case extends beyond one year from the acquisition date, revisions to the accounting for the business combination are recorded in earnings.

All acquisition-related costs, other than the costs to issue debt or equity securities, are accounted for as expenses in the period in which they are incurred. Changes in the fair value of contingent consideration arrangements that are not measurement period adjustments are recognized in earnings.

Long-Lived Assets — Long-lived assets, such as property and equipment and finite-lived intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. When the carrying value of an asset is more than the sum of the undiscounted expected future cash flows, an impairment is recognized. An impairment loss is measured as the excess of the asset’s carrying amount over its fair value. Intangible assets that have finite useful lives are amortized over their estimated useful lives on a straight-line basis.

Goodwill and Other Indefinite-Lived Intangible Assets — Goodwill and other intangible assets that have indefinite useful lives are accounted for in accordance with FASB ASC 350, Intangibles — Goodwill and Other. The Company conducts its evaluation of goodwill impairment at the reporting unit level on an annual basis as of October 31st, and more frequently if events or circumstances indicate that the carrying value of a reporting unit exceeds its fair value. A reporting unit is an operating segment or one level below. The Company does not have intangible assets other than goodwill that have indefinite useful lives.

Derivative Financial Instruments — The Company enters into derivative financial instruments to manage exposure to fluctuations in certain foreign currencies. During 2018, for accounting purposes, these foreign currency forward contracts became designated as hedges, as defined under FASB ASC Topic 815, Derivatives and Hedging. The Company measures these foreign currency derivative contracts at fair value on a recurring basis utilizing Level 2 inputs. The Company records changes in the fair value of these hedges in accumulated other comprehensive income/(loss) until the forecasted transaction occurs. When the forecasted transaction occurs, the Company reclassifies the related gain or loss on the cash flow hedge to cost of revenues (exclusive of depreciation and amortization). In the event the underlying forecasted transaction does not occur, or it becomes probable that it will not occur, the Company reclassifies the gain or loss on the underlying hedge into income. If the Company does not elect hedge accounting, or the contract does not qualify for hedge accounting treatment, the changes in fair value from period to period are recorded in income. The cash flow impact of derivatives identified as hedging instruments is reflected as cash flows from operating activities. The cash flow impact of derivatives not identified as hedging instruments is reflected as cash flows from investing activities.

Fair Value of Financial Instruments — The Company makes assumptions about fair values of its financial assets and liabilities in accordance with FASB ASC Topic 820, Fair Value Measurement, and utilizes the following fair value hierarchy in determining inputs used for valuation:

Level 1 — Quoted prices for identical assets or liabilities in active markets.

Level 2 — Inputs other than quoted prices within Level 1 that are observable either directly or indirectly, including quoted prices in markets that are not active, quoted prices in active markets for similar assets or liabilities, and observable inputs other than quoted prices such as interest rates or yield curves.

Level 3 — Unobservable inputs reflecting management’s view about the assumptions that market participants would use in pricing the asset or liability.

Where the fair values of financial assets and liabilities recorded in the consolidated balance sheets cannot be derived from an active market, they are determined using a variety of valuation techniques. These valuation techniques include a net present value technique, comparison to similar instruments with market observable inputs, option pricing models and other relevant valuation models. To the extent possible, observable market data is used as inputs into these models but when it is not feasible, a degree of judgment is required to establish fair values.

Changes in the fair value of liabilities could cause a material impact to, and volatility in the Company’s operating results. See Note 11 “Fair Value Measurements.”

Revenue Recognition — Effective January 1, 2018, the Company adopted the Accounting Standard Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606) as amended using the modified retrospective method. The standard effectively replaced previously existing revenue recognition guidance (Topic 605) and requires entities to recognize revenue to depict the transfer of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services as well as requires additional disclosure about the nature, amount, timing and uncertainty of revenues and cash flows arising from customer contracts, including significant judgments and changes in judgments.

The Company applied a practical expedient to aggregate the effect of all contract modifications that occurred before the adoption date.

The following table summarizes the impacts of changes in accounting policies after adoption of Topic 606 on the Company’s consolidated Statement of Income and Comprehensive Income for the year ended December 31, 2018, which primarily resulted from deferring the timing of revenue recognition for contracts that were previously recognized on a cash basis and recognizing revenues from certain license agreements at a point-in-time rather than over time:



	Year Ended December 31, 2018
	As Reported		Balances Without Adoption of Topic 606		Effect of Change Higher/(Lower)
Revenues	$	1,842,912	$	1,843,159	$	(247	)
Income from operations	$	245,764	$	246,011	$	(247	)
Provision for income taxes	$	9,517	$	9,572	$	(55	)
Net income	$	240,256	$	240,448	$	(192	)

For the years ended December 31, 2019 and 2018

The Company recognizes revenues when control of goods or services is passed to a customer in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Such control may be transferred over time or at a point in time depending on satisfaction of obligations stipulated by the contract. Consideration expected to be received may consist of both fixed and variable components and is allocated to each separately identifiable performance obligation based on the performance obligation’s relative standalone selling price. Variable consideration usually takes the form of volume-based discounts, service level credits, price concessions or incentives. Determining the estimated amount of such variable consideration involves assumptions and judgment that can have an impact on the amount of revenues reported.

The Company derives revenues from a variety of service arrangements, which have been evolving to provide more customized and integrated solutions to customers by combining software engineering with customer experience design, business consulting and technology innovation services. Fees for these contracts may be in the form of time-and-materials or fixed-price arrangements. The Company generates the majority of its revenues under time-and-material contracts, which are billed using hourly, daily or monthly rates to determine the amounts to be charged directly to the customer. EPAM applies a practical expedient and revenues related to time-and-material contracts are recognized based on the right to invoice for services performed.

Fixed-price contracts include maintenance and support arrangements which may exceed one year in duration. Maintenance and support arrangements generally relate to the provision of ongoing services and revenues for such contracts are recognized ratably over the expected service period. Fixed-price contracts also include application development arrangements, where progress towards satisfaction of the performance obligation is measured using input or output methods and input methods are used only when there is a direct correlation between hours incurred and the end product delivered. Assumptions, risks and uncertainties inherent in the estimates used to measure progress could affect the amount of revenues, receivables and deferred revenues at each reporting period.

Revenues from licenses which have significant stand-alone functionality are recognized at a point in time when control of the license is transferred to the customer. Revenues from licenses which do not have stand-alone functionality are recognized over time.

If there is an uncertainty about the receipt of payment for the services, revenue recognition is deferred until the uncertainty is sufficiently resolved. The Company applies a practical expedient and does not assess the existence of a significant financing component if the period between transfer of the service to a customer and when the customer pays for that service is one year or less.

The Company reports gross reimbursable “out-of-pocket” expenses incurred as both revenues and cost of revenues in the consolidated statements of income and comprehensive income.

For the year ended December 31, 2017

The Company recognized revenue when the following criteria were met: (1) persuasive evidence of an arrangement existed; (2) delivery had occurred; (3) the sales price was fixed or determinable; and (4) collectability was reasonably assured. Determining whether and when some of these criteria had been satisfied often involved assumptions and judgments that could have had a significant impact on the timing and amount of revenue reported.

The Company derived its revenues from a variety of service offerings, which represent specific competencies of its delivery professionals. Contracts for these services have different terms and conditions based on the scope, deliverables, and complexity of the engagement, which require management to make judgments and estimates in determining the appropriate revenue recognition. Fees for these contracts may have been in the form of time-and-materials or fixed-price arrangements. If there was uncertainty about the project completion or receipt of payment for the services, revenue was deferred until the uncertainty was sufficiently resolved. At the time revenue was recognized, the Company provided for any contractual deductions and reduced revenue accordingly. The Company reported gross reimbursable “out-of-pocket” expenses incurred as both revenues and cost of revenues in the consolidated statements of income and comprehensive income.

The Company deferred amounts billed to its customers for revenues not yet earned. Such amounts were anticipated to be recorded as revenues when services were performed in subsequent periods. Unbilled revenue was recorded when services have been provided but billed subsequent to the period end in accordance with the contract terms.

The majority of the Company’s revenues (90.3% of revenues in 2017) were generated under time-and-material contracts whereby revenues were recognized as services were performed with the corresponding cost of providing those services reflected as cost of revenues. The majority of such revenues were billed using hourly, daily or monthly rates as actual time was incurred on the project. Revenues from fixed-price contracts (8.3% of revenues in 2017) included fixed-price maintenance and support arrangements, which may have exceeded one year in duration and revenues from maintenance and support arrangements were generally recognized ratably over the expected service period. Fixed-price contracts also included application development arrangements and revenues from these arrangements were primarily determined using the proportional performance method. In cases where final acceptance of the product, system, or solution was specified by the customer, and the acceptance criteria were not objectively determinable to have been met as the services were provided, revenues were deferred until all acceptance criteria had been met. In the absence of a sufficient basis to measure progress towards completion, revenue was recognized upon receipt of final acceptance from the customer. Assumptions, risks and uncertainties inherent in the estimates used in the application of the proportional performance method of accounting could have affected the amount of revenues, receivables and deferred revenues at each reporting period.

Cost of Revenues (Exclusive of Depreciation and Amortization) — Consists principally of salaries, bonuses, fringe benefits, stock-based compensation, project related travel costs and fees for subcontractors that are assigned to customer projects. Salaries and other compensation expenses of the Company’s delivery professionals are reported as cost of revenues regardless of whether the employees are actually performing client services during a given period.

Selling, General and Administrative Expenses — Consists of expenses associated with promoting and selling the Company’s services and general and administrative functions of the business. These expenses include the costs of salaries, bonuses, fringe benefits, stock-based compensation, severance, bad debt, travel, legal and accounting services, insurance, facilities including operating leases, advertising and other promotional activities. In addition, we pay a membership fee of 1% of revenues generated in Belarus to the administrative organization of the Belarus High-Technologies Park.

Stock-Based Compensation — The Company recognizes the cost of its equity settled stock-based incentive awards based on the fair value of the award at the date of grant, net of estimated forfeitures. The cost is expensed evenly over the service period. The service period is the period over which the employee performs the related services, which is normally the same as the vesting period. Quarterly, the forfeiture assumption is adjusted and such adjustment may affect the timing of recognition of the total amount of expense recognized over the vesting period. Equity-based awards that do not require future service are expensed immediately. Stock-based awards that do not meet the criteria for equity classification are recorded as liabilities and adjusted to fair value at the end of each reporting period.

Income Taxes — The provision for income taxes includes federal, state, local and foreign taxes. Deferred tax assets and liabilities are recognized for the estimated future tax consequences of temporary differences between the financial statement carrying amounts and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the year in which the temporary differences are expected to be reversed. Changes to enacted tax rates would result in either increases or decreases in the provision for income taxes in the period of changes.

The realizability of deferred tax assets is primarily dependent on future earnings. The Company evaluates the realizability of deferred tax assets and recognizes a valuation allowance when it is more likely than not that all, or a portion of, deferred tax assets will not be realized. A reduction in estimated forecasted results may require that we record valuation allowances against deferred tax assets. Once a valuation allowance has been established, it will be maintained until there is sufficient positive evidence to conclude that it is more likely than not that the deferred tax assets will be realized. A pattern of sustained profitability will generally be considered as sufficient positive evidence to reverse a valuation allowance. If the allowance is reversed in a future period, the income tax provision will be correspondingly reduced. Accordingly, the increase and decrease of valuation allowances could have a significant negative or positive impact on future earnings.

On December 22, 2017, the United States enacted the Tax Cuts and Jobs Act (“U.S. Tax Act”), which subjects a U.S. shareholder to taxes on Global Intangible Low-Taxed Income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. During the year ended December 31, 2018, the Company elected to provide for the tax expense related to GILTI in the year the tax is incurred. This election did not have a material impact on the financial statements for the years ended December 31, 2019 or 2018.

Earnings per Share (“EPS”) — Basic EPS is computed by dividing income available to common shareholders by the weighted-average number of shares of common stock outstanding during the period. Diluted earnings per share is computed by dividing income available to common shareholders by the weighted-average number of shares of common stock outstanding during the period, increased by the number of additional shares of common stock that would have been outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include outstanding stock options, unvested restricted stock and unvested restricted stock units (“RSUs”). The dilutive effect of potentially dilutive securities is reflected in diluted earnings per share by application of the treasury stock method.

Foreign Currency Translation — Assets and liabilities of consolidated foreign subsidiaries whose functional currency is not the U.S. dollar are translated into U.S. dollars at period-end exchange rates and revenues and expenses are translated into U.S. dollars at daily exchange rates. The adjustment resulting from translating the financial statements of such foreign subsidiaries into U.S. dollars is reflected as a cumulative translation adjustment and reported as a component of accumulated other comprehensive income/(loss).

For consolidated foreign subsidiaries whose functional currency is the U.S. dollar, transactions and balances denominated in the local currency are foreign currency transactions. Foreign currency transactions and balances related to non-monetary assets and liabilities are remeasured to the functional currency of the subsidiary at historical exchange rates while monetary assets and liabilities are remeasured to the functional currency of the subsidiary at period-end exchange rates. Foreign currency exchange gains or losses from remeasurement are included in income in the period in which they occur.

Risks and Uncertainties — As a result of its global operations, the Company may be subject to certain inherent risks.

Concentration of Credit — Financial instruments that potentially subject the Company to concentration of credit risk consist primarily of cash, cash equivalents and trade receivables. The Company maintains cash, cash equivalents and short-term deposits with financial institutions. The Company determined that the Company’s credit policies reflect normal industry terms and business risk and there is no expectation of non-performance by the counterparties.

The Company has cash in banks in countries such as Belarus, Russia, Ukraine, Kazakhstan, Armenia and Uzbekistan, where the banking sector remains subject to periodic instability. Banking and other financial systems generally do not meet the banking standards of more developed markets, and bank deposits made by corporate entities are not insured. As of December 31, 2019, $206,485 of total cash was kept in banks in these countries, of which $123,370 was held in Belarus. In this region, and particularly in Belarus, a banking crisis, bankruptcy or insolvency of banks that process or hold the Company’s funds, may result in the loss of deposits or adversely affect the Company’s ability to complete banking transactions in the region, which could adversely affect the Company’s business and financial condition. Cash in this region is used for operational needs and cash balances in those banks move with the needs of those entities.

Trade receivables are generally dispersed across many customers operating in different industries; therefore, concentration of credit risk is limited. Historically, credit losses and write-offs of trade receivable balances have not been material to the consolidated financial statements.

Foreign currency risk — The Company’s global operations are conducted predominantly in U.S. dollars. Other than U.S. dollars, the Company generates a significant portion of revenues in various currencies, principally, euros, British pounds, Canadian dollars, Swiss francs and Russian rubles and incurs expenditures principally in Russian rubles, Hungarian forints, Polish zlotys, British pounds, Swiss francs, euros, Indian rupees and Chinese yuan renminbi.

The Company’s international operations expose it to foreign currency exchange rate changes that could impact translations of foreign denominated assets and liabilities into U.S. dollars and future earnings and cash flows from transactions denominated in different currencies. The Company is exposed to fluctuations in foreign currency exchange rates primarily related to trade receivables from sales in foreign currencies and cash outflows for expenditures in foreign currencies. The Company’s results of operations, primarily revenues and expenses denominated in foreign currencies, can be affected if any of the currencies, which are used materially in the Company’s business, appreciate or depreciate against the U.S. dollar. The Company has a hedging program whereby it entered into a series of foreign exchange forward contracts that are designated as cash flow hedges of forecasted Russian ruble, Polish zloty and Indian rupee transactions.

Interest rate risk — The Company’s exposure to market risk is influenced primarily by changes in interest rates received on cash and cash equivalents and paid on the Company’s borrowings, mainly under the 2017 Credit Facility, which is subject to a variety of rates depending on the type and timing of funds borrowed (See Note 8 “Long-Term Debt”). The Company does not use derivative financial instruments to hedge the risk of interest rate volatility.

Adoption of New Accounting Standards

Unless otherwise discussed below, the adoption of new accounting standards did not have a material impact on the Company’s consolidated financial position, results of operations, and cash flows.

Leases — In February 2016, the FASB issued ASU 2016-02, Leases (“Topic 842”). The standard supersedes previously existing lease guidance (Topic 840) and requires entities to recognize all leases, with the exception of leases with a term of twelve months or less, on the balance sheet as right-of-use assets (“RoU Assets”) and lease liabilities. The guidance also changes disclosure requirements with a focus on providing information that will enable users of financial statements to assess the amount, timing and uncertainty of cash flows arising from leases.

The Company adopted Topic 842, effective January 1, 2019, using the optional transition approach, which allows the Company to apply the provisions of the standard at the effective date without adjusting the comparable periods and carry forward disclosures under previously existing guidance for those periods presented within the Company’s financial statements.

The Company determines if an arrangement is a lease or contains a lease at inception. The Company performs an assessment and classifies the lease as either an operating lease or a financing lease at the lease commencement date with a right-of-use asset and a lease liability recognized in the consolidated balance sheet under both classifications. The Company does not have finance leases that are material to the Company’s consolidated financial statements.

Lease liabilities are initially measured at the present value of lease payments not yet paid. The present value is determined by applying the readily determinable rate implicit in the lease or, if not available, the incremental borrowing rate of the lessee. The Company determines the incremental borrowing rate of the lessee on a lease-by-lease basis by developing an estimated centralized U.S. dollar borrowing rate for a fully collateralized obligation with a term similar to the lease term and adjusts the rate to reflect the incremental risk associated with the foreign currency in which the lease is denominated. The development of this estimate includes the use of recovery rates, U.S. risk-free rates, foreign currency/country base rate yields, and a synthetic corporate credit rating of the Company developed using regression analysis. Lease agreements of the Company may include options to extend or terminate the lease and the Company includes such options in the lease term when it is reasonably certain that the Company will exercise that option. RoU Assets are recognized based on the initial measurement of the lease liabilities plus initial direct costs less lease incentives and, according to the guidance for long-lived assets, RoU Assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Lease expense for operating leases is recognized on a straight-line basis over the lease term.

The Company elected a practical expedient to account for lease and non-lease components together as a single lease component. The Company also elected the short-term lease recognition exemption for all classes of lease assets with an original term of twelve months or less. As part of the transition, the Company elected a package of practical expedients allowing it to carry forward historical accounting for any expired or existing contracts that are or contain lease contracts, including classification of such contracts and initial direct costs associated with them.

The adoption of Topic 842 on January 1, 2019 resulted in the recognition of RoU Assets for operating leases of $177,597 and operating lease liabilities of $173,863. The adoption of Topic 842 did not have a material impact on the consolidated statement of income and comprehensive income, consolidated statement of changes in stockholders’ equity or the consolidated statement of cash flows.

See Note 7 “Leases” in the condensed consolidated financial statements for additional information regarding leases.

Pending Accounting Standards

From time to time, new accounting pronouncements are issued by the FASB or other standards-setting bodies that the Company will adopt according to the various timetables the FASB specifies. Unless otherwise discussed below, the Company believes the impact of recently issued standards that are not yet effective will not have a material impact on its consolidated financial position, results of operations and cash flows upon adoption.

Measurement of Credit Losses on Financial Instruments — Effective January 1, 2020, the Company will adopt the amended guidance of FASB ASC Topic 326, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, (with early adoption permitted effective January 1, 2019.) The amendments in this update change how companies measure and recognize credit impairment for many financial assets. The new expected credit loss model requires companies to immediately recognize an estimate of credit losses expected to occur over the remaining life of the financial assets (including trade receivables) that are in the scope of the update. The update also made amendments to the current impairment model for held-to-maturity and available-for-sale debt securities and certain guarantees. Entities are required to adopt the standard using a modified-retrospective approach through a cumulative effect adjustment to retained earnings as of the beginning of the period of adoption. The Company does not expect Topic 326 to have a material impact on its consolidated financial statements.

INCOME TAXES (Effective Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Provision for income taxes at federal statutory rate									$ 62,898	$ 52,452	$ 61,007
Increase/ (decrease) in taxes resulting from:
Impact from U.S. Tax Act									0	(4,009)	74,632
Entity classification election deferred tax asset impact									0	(25,962)	0
GILTI and BEAT U.S. taxes									(926)	1,526	0
Excess tax benefits relating to stock-based compensation									(28,385)	(17,370)	(9,307)
Subsidiary withholding tax liability and related foreign tax credit									0	(4,850)
Subsidiary withholding tax liability and related foreign tax credit											4,850
Foreign tax expense and tax rate differential									(1,402)	(88)	(39,997)
Effect of permanent differences									3,264	2,724	3,205
State taxes, net of federal benefit									2,971	3,452	(116)
Change in valuation allowance									218	151	783
Stock-based compensation expense									571	652	6,908
Other									(740)	839	(420)
Total	$ 10,273	$ 12,967	$ 11,733	$ 3,496	$ 18,803	$ 369	$ 6,864	$ (16,519)	$ 38,469	$ 9,517	$ 101,545
Effective tax rate									12.80%	3.80%	58.30%
Net deferred tax assets resulting from the change in tax status of foreign subsidiaries	$ 25,962								$ 25,962
ASU 2016-09
Increase/ (decrease) in taxes resulting from:
Excess tax benefit									$ 28,385	$ 17,370	$ 9,307

LONG-TERM DEBT (Details) - USD ($) $ in Thousands				3 Months Ended
LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Mar. 15, 2018	May 24, 2017	Sep. 12, 2014	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Continuum
Debt Instrument [Line Items]
Maturity date	Mar. 31, 2029
Long-term debt	$ 3,448
Contractual interest rate	8.00%
Repayments of debt				$ 3,448
Revolving Credit Facility \| 2014 Credit Facility \| LIBOR
Debt Instrument [Line Items]
Variable interest rate spread			1.00%
Revolving Credit Facility \| 2014 Credit Facility \| Overnight Bank Funding Rate
Debt Instrument [Line Items]
Variable interest rate spread			0.50%
Revolving Credit Facility \| 2014 Credit Facility \| U.S. Dollars
Debt Instrument [Line Items]
Line of credit, current borrowing capacity			$ 100,000
Line of credit, maximum borrowing capacity			200,000
Revolving Credit Facility \| 2014 Credit Facility \| Other currencies, excluding U.S. dollars
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity			$ 50,000
Revolving Credit Facility \| 2017 Credit Facility
Debt Instrument [Line Items]
Maturity date		May 24, 2022
Revolving Credit Facility \| 2017 Credit Facility \| LIBOR
Debt Instrument [Line Items]
Variable interest rate spread		1.00%
Revolving Credit Facility \| 2017 Credit Facility \| Overnight Bank Funding Rate
Debt Instrument [Line Items]
Variable interest rate spread		0.50%
Revolving Credit Facility \| 2017 Credit Facility \| U.S. Dollars
Debt Instrument [Line Items]
Line of credit, current borrowing capacity		$ 300,000
Line of credit, maximum borrowing capacity		400,000
Outstanding debt					$ 25,000	$ 25,000
Interest rate					2.80%	3.50%
Available borrowing capacity					$ 274,697	$ 274,618
Revolving Credit Facility \| 2017 Credit Facility \| U.S. Dollars \| Maximum
Debt Instrument [Line Items]
Line of credit, current borrowing capacity					300,000	300,000
Revolving Credit Facility \| 2017 Credit Facility \| Other currencies, excluding U.S. dollars
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity		$ 100,000
Standby Letters of Credit \| 2017 Credit Facility
Debt Instrument [Line Items]
Irrevocable standby letters of credit					$ 303	$ 382

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Goodwill and Other Indefinite-Lived Intangible Assets) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Indefinite-lived intangible assets other than goodwill	$ 0

LONG-TERM DEBT

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

LONG-TERM DEBT

Revolving Line of Credit — On September 12, 2014, the Company entered into a revolving loan agreement (the “2014 Credit Facility”) with PNC Bank, National Association; Santander Bank, N.A; and Silicon Valley Bank (collectively the “2014 Lenders”). Under the 2014 Credit Facility, the Company’s borrowing capacity was set at $100,000, with potential to increase it to $200,000 if certain conditions were met.

Borrowings under the 2014 Credit Facility were denominated in U.S. dollars or, up to a maximum of $50,000 in British pounds, Canadian dollars, euros and Swiss francs and other currencies as may be approved by the administrative agent and the 2014 Lenders. Borrowings under the 2014 Credit Facility bore interest at either a base rate or Euro-rate plus a margin based on the Company’s leverage ratio. The base rate was equal to the highest of (a) the Federal Funds Open Rate, plus 0.5%, (b) the Prime Rate, and (c) the Daily LIBOR Rate, plus 1.0%.

On May 24, 2017, the Company terminated the 2014 Credit Facility and entered into a new unsecured credit facility (the “2017 Credit Facility”), as may be amended from time to time, with PNC Bank, National Association; PNC Capital Markets LLC; Citibank N.A.; Wells Fargo Bank, National Association; Fifth Third Bank and Santander Bank, N.A. (collectively the “Lenders”). The 2017 Credit Facility provides for a borrowing capacity of $300,000, with potential to increase the credit facility up to $400,000 if certain conditions are met. The 2017 Credit Facility matures on May 24, 2022.

Borrowings under the 2017 Credit Facility may be denominated in U.S. dollars or up to a maximum of $100,000 in British pounds, Canadian dollars, euros and Swiss francs and other currencies as may be approved by the administrative agent and the Lenders. Borrowings under the 2017 Credit Facility bear interest at either a base rate or Euro-rate plus a margin based on the Company’s leverage ratio. The base rate is equal to the highest of (a) the Overnight Bank Funding Rate, plus 0.5%, (b) the Prime Rate, or (c) the Daily LIBOR Rate, plus 1.0%. As of December 31, 2019, the Company’s outstanding borrowings are subject to a LIBOR-based interest rate, which resets regularly at issuance, based on lending terms.

The 2017 Credit Facility includes customary business and financial covenants that may restrict the Company’s ability to make or pay dividends (other than certain intercompany dividends) if a potential or an actual event of default has occurred or would be triggered. As of December 31, 2019, the Company was in compliance with all covenants contained in the 2017 Credit Facility.

The following table presents the outstanding debt and borrowing capacity of the Company under the 2017 Credit Facility:



	As of December 31, 2019			As of December 31, 2018
Outstanding debt	$	25,000		$	25,000
Interest rate	2.8		%	3.5		%
Irrevocable standby letters of credit	$	303		$	382
Available borrowing capacity	$	274,697		$	274,618
Current maximum borrowing capacity	$	300,000		$	300,000

As part of the acquisition of Continuum in 2018, the Company assumed $3,448 of long-term debt associated with a leased facility and payable to Continuum’s landlord. The debt was payable in monthly installments through March 31, 2029 and bore interest at a rate of 8% per annum. In March 2018, the Company paid $3,448 to settle this assumed long-term debt.

INCOME TAXES (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal									$ 16,943	$ 10,814	$ 65,571
State									3,610	4,123	(204)
Foreign									25,680	42,580	23,617
Deferred
Federal									(9,425)	(37,785)	7,235
State									(358)	(3,548)	(90)
Foreign									2,019	(6,667)	5,416
Total	$ 10,273	$ 12,967	$ 11,733	$ 3,496	$ 18,803	$ 369	$ 6,864	$ (16,519)	$ 38,469	$ 9,517	$ 101,545

FAIR VALUE MEASUREMENTS (Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	$ 3,876	$ 8,390	$ 0
Recurring
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value on a recurring basis	1,910	181
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	10,495	7,468
Total financial liabilities measured at fair value on a recurring basis	10,738	10,943
Recurring \| Foreign Exchange Forward Contract
Assets, Fair Value Disclosure [Abstract]
Foreign exchange derivative assets	1,910	181
Liabilities, Fair Value Disclosure [Abstract]
Foreign exchange derivative liabilities	243	3,475
Recurring \| Level 1
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value on a recurring basis	0	0
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	0	0
Total financial liabilities measured at fair value on a recurring basis	0	0
Recurring \| Level 1 \| Foreign Exchange Forward Contract
Assets, Fair Value Disclosure [Abstract]
Foreign exchange derivative assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Foreign exchange derivative liabilities	0	0
Recurring \| Level 2
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value on a recurring basis	1,910	181
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	0	0
Total financial liabilities measured at fair value on a recurring basis	243	3,475
Recurring \| Level 2 \| Foreign Exchange Forward Contract
Assets, Fair Value Disclosure [Abstract]
Foreign exchange derivative assets	1,910	181
Liabilities, Fair Value Disclosure [Abstract]
Foreign exchange derivative liabilities	243	3,475
Recurring \| Level 3
Assets, Fair Value Disclosure [Abstract]
Total assets measured at fair value on a recurring basis	0	0
Liabilities, Fair Value Disclosure [Abstract]
Contingent consideration	10,495	7,468
Total financial liabilities measured at fair value on a recurring basis	10,495	7,468
Recurring \| Level 3 \| Foreign Exchange Forward Contract
Assets, Fair Value Disclosure [Abstract]
Foreign exchange derivative assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Foreign exchange derivative liabilities	$ 0	$ 0

STOCK-BASED COMPENSATION (Equity Plans) (Details) - shares	Jun. 11, 2015	Jan. 11, 2012	May 31, 2006	Dec. 31, 2019
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance (in shares)				4,969,754
Expiration period	10 years
2012 Directors Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance (in shares)				528,441
Number of shares authorized for issuance (in shares)		600,000
Expiration period		10 years
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
2006 Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			10 years

REVENUES (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Change in Contract with Customer, Liability [Abstract]
Revenues from performance obligations satisfied in previous periods	$ 7,806	$ 5,736
Trade Receivables and Contract Assets
Change in Contract with Customer, Liability [Abstract]
Contract assets	14,320	13,522
Accrued Expenses and Other Current Liabilities
Change in Contract with Customer, Liability [Abstract]
Revenues recognized	3,850	3,810
Contract liabilities	9,132	4,558
Other Noncurrent Liabilities
Change in Contract with Customer, Liability [Abstract]
Contract liabilities	$ 5	$ 224

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Lease) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
RoU Assets for operating leases	$ 238,991		$ 0
Operating lease liabilities	$ 238,389
Topic 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
RoU Assets for operating leases		$ 177,597
Operating lease liabilities		$ 173,863

INCOME TAXES (Deferred Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Gross [Abstract]
Property and equipment	$ 5,329	$ 4,531
Intangible assets	574	1,262
Accrued expenses	41,457	32,067
Net operating loss carryforward	5,168	4,983
Deferred revenue	3,510	5,802
Stock-based compensation	29,596	27,558
Operating lease liabilities	7,438	0
Foreign tax credit	3,491	0
Foreign currency exchange	2,499	5,772
Other assets	1,533	782
Deferred tax assets	100,595	82,757
Less: valuation allowance	(3,877)	(3,189)
Total deferred tax assets	96,718	79,568
Deferred Tax Liabilities, Gross [Abstract]
Property and equipment	4,981	1,480
Intangible assets	11,364	5,582
Operating lease right-of-use assets	6,900	0
Accrued revenue and expenses	2,176	1,540
U.S. taxation of foreign subsidiaries	0	3,000
Other liabilities	812	933
Total deferred tax liabilities	26,233	12,535
Net deferred tax assets	70,485	67,033
Other Noncurrent Liabilities
Deferred Tax Liabilities, Classification [Abstract]
Deferred tax liabilities, noncurrent	4,530	2,950
Business acquisitions
Deferred Tax Assets, Gross [Abstract]
Stock-based compensation	$ 6,788	$ 7,561
Business acquisitions \| Minimum
Deferred Tax Assets, Gross [Abstract]
Amortization period of stock-based compensation for tax	10 years
Business acquisitions \| Maximum
Deferred Tax Assets, Gross [Abstract]
Amortization period of stock-based compensation for tax		15 years

SUBSEQUENT EVENTS (Notes)	12 Months Ended
SUBSEQUENT EVENTS (Notes)	Dec. 31, 2019
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On February 3, 2020, the Company acquired 100% of Deltix and its affiliates, a provider of software and services for quantitative research to the financial sector. The Company paid approximately $10,620 in cash at closing and could pay up to $18,975 in earn-out consideration based on achievement of certain revenue and earnings targets. In addition, the Company granted to Deltix employees 17,981 service-based RSUs and performance and service-based equity-settled awards that could pay up to $13,915 based on achievement of certain revenue and earnings targets.

VALUATION AND QUALIFYING ACCOUNTS (Tables)

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts



	Balance at Beginning of Year		Additions	Deductions/ Write offs		Balance at End of Year
Year Ended December 31, 2019
Allowance for doubtful accounts for trade receivables and contract assets	$	1,557	2,072	(419	)	$	3,210
Valuation allowance on deferred tax assets	$	3,189	688	—		$	3,877
Year Ended December 31, 2018
Allowance for doubtful accounts for trade receivables and contract assets	$	1,186	2,722	(2,351	)	$	1,557
Valuation allowance on deferred tax assets	$	924	2,265	—		$	3,189
Year Ended December 31, 2017
Allowance for doubtful accounts for trade receivables and contract assets	$	2,014	998	(1,826	)	$	1,186
Valuation allowance on deferred tax assets	$	—	924	—		$	924

INCOME TAXES (U.S. Tax Act Effect) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability [Abstract]
Income tax payable related to one-time transition tax			$ 64,321
Income tax payable related to transition tax payment period			8 years
Provisional charge adjustment		$ (4,935)	$ (64,321)
Transition tax provisional charge	$ 59,386
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) [Abstract]
Provisional deferred income tax expense recorded	926	10,311
Total adjustment to deferred tax asset recorded	11,237
Income tax expense (benefit) related to withholding tax payable			$ 4,850
Net income tax benefit resulting from U.S. foreign tax credit for withholding tax	0	$ 4,850
Accumulated undistributed foreign earnings indefinitely reinvested	$ 861,893
United States
Effect of Tax Cuts and Jobs Act, Incomplete Accounting, Provisional [Abstract]
Statutory income tax rate			35.00%
U.S. Tax Cuts and Jobs Act
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability [Abstract]
Income tax rate on foreign cash and certain other net current assets			15.50%
Income tax rate on remaining earnings			8.00%
U.S. Tax Cuts and Jobs Act \| United States
Effect of Tax Cuts and Jobs Act, Incomplete Accounting, Provisional [Abstract]
Statutory income tax rate		21.00%
U.S. Tax Cuts and Jobs Act \| Belarus
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) [Abstract]
Accumulated earnings that are no longer indefinitely reinvested			$ 97,000
Income tax expense (benefit) related to withholding tax payable			$ 4,850
Net income tax benefit resulting from U.S. foreign tax credit for withholding tax		$ 4,850

QUARTERLY FINANCIAL DATA (UNAUDITED)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY FINANCIAL DATA (UNAUDITED)

Summarized quarterly results for the years ended December 31, 2019 and 2018 were as follows:



	Three Months Ended
2019	March 31			June 30			September 30			December 31			Full Year
Revenues	$	521,333		$	551,587		$	588,103		$	632,775		$	2,293,798
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	344,689			355,915			377,525			410,069			1,488,198
Selling, general and administrative expenses	101,786			111,762			118,886			124,999			457,433
Depreciation and amortization expense	10,200			11,028			11,127			12,962			45,317
Income from operations	64,658			72,882			80,565			84,745			302,850
Interest and other income, net	3,076			1,190			2,509			1,950			8,725
Foreign exchange loss	(3,484		)	(3,562		)	(3,105		)	(1,898		)	(12,049		)
Income before provision for income taxes	64,250			70,510			79,969			84,797			299,526
Provision for income taxes	3,496			11,733			12,967			10,273			38,469
Net income	$	60,754		$	58,777		$	67,002		$	74,524		$	261,057
Comprehensive income	$	66,797		$	62,934		$	54,725		$	86,741		$	271,197
Basic net income per share⁽¹⁾	$	1.12		$	1.07		$	1.22		$	1.35		$	4.77
Diluted net income per share⁽¹⁾	$	1.06		$	1.02		$	1.16		$	1.29		$	4.53


(1)	Earnings per share amounts for each quarter may not necessarily total to the yearly earnings per share due to the weighting of shares outstanding on a quarterly and year to date basis.



	Three Months Ended
2018	March 31			June 30		September 30			December 31			Full Year
Revenues	$	424,148		$	445,647	$	468,186		$	504,931		$	1,842,912
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	277,634			289,175		301,081			319,031			1,186,921
Selling, general and administrative expenses	89,641			93,273		93,226			97,447			373,587
Depreciation and amortization expense	8,176			8,962		9,319			10,183			36,640
Income from operations	48,697			54,237		64,560			78,270			245,764
Interest and other income/(expense), net	(551		)	1,052		1,941			1,080			3,522
Foreign exchange gain/(loss)	(247		)	1,830		(514		)	(582		)	487
Income before provision for/(benefit from) income taxes	47,899			57,119		65,987			78,768			249,773
Provision for/(benefit from) income taxes	(16,519		)	6,864		369			18,803			9,517
Net income	$	64,418		$	50,255	$	65,618		$	59,965		$	240,256
Comprehensive income	$	67,796		$	32,345	$	63,426		$	52,798		$	216,365
Basic net income per share⁽¹⁾	$	1.21		$	0.94	$	1.22		$	1.11		$	4.48
Diluted net income per share⁽¹⁾	$	1.15		$	0.89	$	1.15		$	1.05		$	4.24

(1)

Earnings per share amounts for each quarter may not necessarily total to the yearly earnings per share due to the weighting of shares outstanding on a quarterly and year to date basis.

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Effect of Adoption of Topic 606) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement
Revenues	$ 632,775	$ 588,103	$ 551,587	$ 521,333	$ 504,931	$ 468,186	$ 445,647	$ 424,148	$ 2,293,798	$ 1,842,912	$ 1,450,448
Income from operations	84,745	80,565	72,882	64,658	78,270	64,560	54,237	48,697	302,850	245,764	172,946
Provision for income taxes	10,273	12,967	11,733	3,496	18,803	369	6,864	(16,519)	38,469	9,517	101,545
Net income	$ 74,524	$ 67,002	$ 58,777	$ 60,754	$ 59,965	$ 65,618	$ 50,255	$ 64,418	$ 261,057	240,256	$ 72,760
Balance Under Revenue Guidance in Effect Before Topic 606
Income Statement
Revenues										1,843,159
Income from operations										246,011
Provision for income taxes										9,572
Net income										240,448
Topic 606 \| Adjustments
Income Statement
Revenues										(247)
Income from operations										(247)
Provision for income taxes										(55)
Net income										$ (192)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

ACQUISITIONS (Fair Values of Net Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2019	Nov. 01, 2018	Mar. 15, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 195,043	$ 166,832				$ 119,531
Continuum
Business Acquisition [Line Items]
Cash and cash equivalents					$ 2,251
Trade receivables and contract assets					9,139
Prepaid and other current assets					936
Goodwill					26,617
Intangible assets					14,450
Property and equipment and other noncurrent assets					8,902
Total assets acquired					62,295
Accounts payable, accrued expenses and other current liabilities					3,746
Long-term debt (Note 8)					3,220
Other noncurrent liabilities					490
Total liabilities assumed					7,456
Net assets acquired					$ 54,839
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Purchase price adjustment		(76)
Total net assets purchase accounting adjustment		$ (76)
Think
Business Acquisition [Line Items]
Cash and cash equivalents				$ 2,344
Trade receivables and contract assets				2,637
Prepaid and other current assets				900
Goodwill				20,477
Intangible assets				6,882
Property and equipment and other noncurrent assets				1,214
Total assets acquired				34,454
Accounts payable, accrued expenses and other current liabilities				2,025
Long-term debt (Note 8)				0
Other noncurrent liabilities				0
Total liabilities assumed				2,025
Net assets acquired				$ 32,429
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Purchase price adjustment	185
Total net assets purchase accounting adjustment	185
Increase in deferred tax assets	1,497
Goodwill purchase accounting adjustment	(2,043)
test IO
Business Acquisition [Line Items]
Cash and cash equivalents			$ 663
Trade receivables and contract assets			688
Prepaid and other current assets			96
Goodwill			12,150
Intangible assets			6,219
Property and equipment and other noncurrent assets			151
Total assets acquired			19,967
Accounts payable, accrued expenses and other current liabilities			910
Long-term debt (Note 8)			0
Other noncurrent liabilities			1,734
Total liabilities assumed			2,644
Net assets acquired			$ 17,323
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Purchase price adjustment	119
Total net assets purchase accounting adjustment	119
Intangible assets purchase accounting adjustment	(145)
Goodwill purchase accounting adjustment	145
Other 2019 Acquisitions
Business Acquisition [Line Items]
Intangible assets	$ 7,488

STOCK-BASED COMPENSATION (Fair Value of Restricted Stock and Restricted Stock Units Vested) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Service Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	$ 66,633	$ 35,478	$ 27,038
Performance Targets
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	0	1,046	9,085
Equity Classified Award \| Service Period \| Equity-Settled Award \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	73	142	12,607
Equity Classified Award \| Service Period \| Equity-Settled Award \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	48,111	24,987	10,620
Equity Classified Award \| Performance Targets \| Equity-Settled Award \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	0	0	452
Equity Classified Award \| Performance Targets \| Equity-Settled Award \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	0	1,046	0
Liability Classified Award \| Service Period \| Cash-Settled Award \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	18,449	10,349	3,811
Liability Classified Award \| Performance Targets \| Equity-Settled Award \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested	$ 0	$ 0	$ 8,633

ACQUISITIONS (Fair Values and Useful Lives of Intangible Assets Acquired) (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Nov. 01, 2018	Mar. 15, 2018
Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount			$ 14,450
Think
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount		$ 6,882
test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount	$ 6,219
Customer relationships \| Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)			6 years 6 months
Finite-lived intangible assets acquired, amount			$ 5,800
Customer relationships \| Think
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)		7 years
Finite-lived intangible assets acquired, amount		$ 6,117
Customer relationships \| test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	7 years
Finite-lived intangible assets acquired, amount	$ 2,456
Favorable lease \| Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)			11 years 2 months 12 days
Finite-lived intangible assets acquired, amount			$ 5,500
Favorable lease \| Think
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount		0
Favorable lease \| test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount	$ 0
Software \| Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount			$ 0
Software \| Think
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount		0
Software \| test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	6 years
Finite-lived intangible assets acquired, amount	$ 3,461
Contract royalties \| Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)			8 years
Finite-lived intangible assets acquired, amount			$ 1,900
Contract royalties \| Think
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount		$ 0
Contract royalties \| test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired, amount	$ 0
Trade names \| Continuum
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)			5 years
Finite-lived intangible assets acquired, amount			$ 1,250
Trade names \| Think
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)		5 years
Finite-lived intangible assets acquired, amount		$ 765
Trade names \| test IO
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life (in years)	4 years
Finite-lived intangible assets acquired, amount	$ 302

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Impact of Reclassifications on the Consolidated Balance Sheet Allowance) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Trade receivables and contract assets allowance	$ 2,920	$ 1,557
Previously Reported [Member]
Accounts receivable allowance		$ 1,557