EPAM Systems (EPAM) 10-Q 6 Aug 20 2020 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-35418
Entity Registrant Name	EPAM SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-3536104
Entity Address, Street Name	41 University Drive
Entity Address, Suite No.	Suite 202
Entity Address, City or Town	Newtown
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	18940
City Area Code	267
Local Phone Number	759-9000
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	EPAM
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Central Index Key	0001352010
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		55,852,596
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 993,724	$ 936,552
Short-term investments	60,025	9
Trade receivables and contract assets, net of allowance of $6,070 and $2,920, respectively	506,908	497,716
Prepaid and other current assets	37,679	39,934
Total current assets	1,598,336	1,474,211
Property and equipment, net	167,359	165,259
Operating lease right-of-use assets	234,760	238,991
Intangible assets, net	55,887	56,258
Goodwill	199,039	195,043
Deferred tax assets	78,102	75,013
Other noncurrent assets	55,647	39,433
Total assets	2,389,130	2,244,208
Current liabilities
Accounts payable	7,596	7,831
Accrued compensation and benefits expenses	223,436	230,035
Accrued expenses and other current liabilities	62,639	82,476
Income taxes payable, current	10,972	9,064
Operating lease liabilities, current	60,937	57,542
Total current liabilities	365,580	386,948
Long-term debt	25,044	25,074
Income taxes payable, noncurrent	43,391	45,878
Operating lease liabilities, noncurrent	181,705	180,848
Other noncurrent liabilities	20,316	9,315
Total liabilities	636,036	648,063
Commitments and contingencies (Note 12)
Stockholders’ equity
Common stock, $0.001 par value; 160,000,000 authorized; 55,845,686 and 55,207,446 shares issued, 55,825,951 and 55,187,711 shares outstanding at June 30, 2020 and December 31, 2019, respectively	56	55
Additional paid-in capital	630,679	607,051
Retained earnings	1,172,909	1,020,590
Treasury stock	(177)	(177)
Accumulated other comprehensive loss	(50,373)	(31,374)
Total stockholders’ equity	1,753,094	1,596,145
Total liabilities and stockholders’ equity	$ 2,389,130	$ 2,244,208

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Trade receivables and contract assets allowance	$ 6,070	$ 2,920
Stockholders' equity
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	55,845,686	55,207,446
Common stock, shares outstanding (in shares)	55,825,951	55,187,711

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 632,383	$ 551,587	$ 1,283,742	$ 1,072,920
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	419,540	355,915	843,342	700,604
Selling, general and administrative expenses	114,191	111,762	239,299	213,548
Depreciation and amortization expense	15,226	11,028	30,166	21,228
Income from operations	83,426	72,882	170,935	137,540
Interest and other income, net	1,817	1,190	4,203	4,266
Foreign exchange loss	(9,167)	(3,562)	(2,643)	(7,046)
Income before provision for income taxes	76,076	70,510	172,495	134,760
Provision for income taxes	9,452	11,733	20,306	15,229
Net income	66,624	58,777	152,189	119,531
Foreign currency translation adjustments, net of tax	12,442	2,620	(16,077)	5,563
Unrealized gain/(loss) on cash-flow hedging instruments, net of tax	6,446	1,537	(2,922)	4,637
Comprehensive income	$ 85,512	$ 62,934	$ 133,190	$ 129,731
Net income per share:
Basic (in dollars per share)	$ 1.20	$ 1.07	$ 2.74	$ 2.19
Diluted (in dollars per share)	$ 1.14	$ 1.02	$ 2.62	$ 2.08
Shares used in calculation of net income per share:
Basic (in shares)	55,700,706	54,681,959	55,493,727	54,464,753
Diluted (in shares)	58,246,231	57,614,284	58,194,401	57,426,563

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Restricted stock units	Cumulative effect of adoption	Adjusted balance	Common Stock	Common StockRestricted stock units	Common StockAdjusted balance	Additional Paid-in Capital	Additional Paid-in CapitalRestricted stock units	Additional Paid-in CapitalAdjusted balance	Retained Earnings	Retained EarningsCumulative effect of adoption	Retained EarningsAdjusted balance	Treasury Stock	Treasury StockAdjusted balance	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive LossAdjusted balance
Balance, beginning of period (in shares) at Dec. 31, 2018					54,080,192
Balance, beginning of period at Dec. 31, 2018	$ 1,262,596				$ 54			$ 544,700			$ 759,533					$ (41,514)
Treasury stock, beginning of period (in shares) at Dec. 31, 2018														19,735
Treasury stock, beginning period at Dec. 31, 2018														$ (177)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures [Abstract]
Stock units vested (in shares)						242,414
Stock units withheld for employee taxes		$ (13,483)							$ (13,483)
Stock units withheld for employee taxes (in shares)						(81,562)
Proceeds from stock options exercises	11,890							11,890
Proceeds from stock options exercises (in shares)					323,464
Stock-based compensation expense	10,425							10,425
Foreign currency translation adjustments, net of tax	2,943															2,943
Change in unrealized gains and losses on cash flow hedges, net of tax	3,100															3,100
Net income	60,754										60,754
Balance, end of period (in shares) at Mar. 31, 2019					54,564,508
Balance, end of period at Mar. 31, 2019	1,338,225				$ 54			553,532			820,287					(35,471)
Treasury stock, end of period (in shares) at Mar. 31, 2019														19,735
Treasury stock, end of period at Mar. 31, 2019														$ (177)
Balance, beginning of period (in shares) at Dec. 31, 2018					54,080,192
Balance, beginning of period at Dec. 31, 2018	1,262,596				$ 54			544,700			759,533					(41,514)
Treasury stock, beginning of period (in shares) at Dec. 31, 2018														19,735
Treasury stock, beginning period at Dec. 31, 2018														$ (177)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures [Abstract]
Foreign currency translation adjustments, net of tax	5,563
Change in unrealized gains and losses on cash flow hedges, net of tax	4,637
Net income	119,531
Balance, end of period (in shares) at Jun. 30, 2019					54,779,289
Balance, end of period at Jun. 30, 2019	1,422,247				$ 55			574,619			879,064					(31,314)
Treasury stock, end of period (in shares) at Jun. 30, 2019														19,735
Treasury stock, end of period at Jun. 30, 2019														$ (177)
Balance, beginning of period (in shares) at Mar. 31, 2019					54,564,508
Balance, beginning of period at Mar. 31, 2019	1,338,225				$ 54			553,532			820,287					(35,471)
Treasury stock, beginning of period (in shares) at Mar. 31, 2019														19,735
Treasury stock, beginning period at Mar. 31, 2019														$ (177)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures [Abstract]
Stock units vested (in shares)						11,757
Stock units withheld for employee taxes		(363)							(363)
Stock units withheld for employee taxes (in shares)						(2,084)
Proceeds from stock options exercises	10,584				$ 1			10,583
Proceeds from stock options exercises (in shares)					205,108
Stock-based compensation expense	10,867							10,867
Foreign currency translation adjustments, net of tax	2,620															2,620
Change in unrealized gains and losses on cash flow hedges, net of tax	1,537															1,537
Net income	58,777										58,777
Balance, end of period (in shares) at Jun. 30, 2019					54,779,289
Balance, end of period at Jun. 30, 2019	$ 1,422,247				$ 55			574,619			879,064					(31,314)
Treasury stock, end of period (in shares) at Jun. 30, 2019														19,735
Treasury stock, end of period at Jun. 30, 2019														$ (177)
Balance, beginning of period (in shares) at Dec. 31, 2019	55,187,711				55,187,711		55,187,711
Balance, beginning of period at Dec. 31, 2019	$ 1,596,145			$ 1,596,275	$ 55		$ 55	607,051		$ 607,051	1,020,590		$ 1,020,720			(31,374)	$ (31,374)
Balance, beginning of period (ASU 2016-13) at Dec. 31, 2019			$ 130									$ 130
Treasury stock, beginning of period (in shares) at Dec. 31, 2019														19,735	19,735
Treasury stock, beginning period at Dec. 31, 2019														$ (177)	$ (177)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures [Abstract]
Stock units vested (in shares)						273,904
Stock units withheld for employee taxes		(15,822)							(15,822)
Stock units withheld for employee taxes (in shares)						(89,990)
Proceeds from stock options exercises	7,141				$ 1			7,140
Proceeds from stock options exercises (in shares)					217,475
Stock-based compensation expense	12,210							12,210
Foreign currency translation adjustments, net of tax	(28,519)															(28,519)
Change in unrealized gains and losses on cash flow hedges, net of tax	(9,368)															(9,368)
Net income	85,565										85,565
Balance, end of period (in shares) at Mar. 31, 2020					55,589,100
Balance, end of period at Mar. 31, 2020	$ 1,647,482				$ 56			610,579			1,106,285					(69,261)
Treasury stock, end of period (in shares) at Mar. 31, 2020														19,735
Treasury stock, end of period at Mar. 31, 2020														$ (177)
Balance, beginning of period (in shares) at Dec. 31, 2019	55,187,711				55,187,711		55,187,711
Balance, beginning of period at Dec. 31, 2019	$ 1,596,145			$ 1,596,275	$ 55		$ 55	607,051		$ 607,051	1,020,590		$ 1,020,720			(31,374)	$ (31,374)
Balance, beginning of period (ASU 2016-13) at Dec. 31, 2019			$ 130									$ 130
Treasury stock, beginning of period (in shares) at Dec. 31, 2019														19,735	19,735
Treasury stock, beginning period at Dec. 31, 2019														$ (177)	$ (177)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures [Abstract]
Foreign currency translation adjustments, net of tax	(16,077)
Change in unrealized gains and losses on cash flow hedges, net of tax	(2,922)
Net income	$ 152,189
Balance, end of period (in shares) at Jun. 30, 2020	55,825,951				55,825,951
Balance, end of period at Jun. 30, 2020	$ 1,753,094				$ 56			630,679			1,172,909					(50,373)
Treasury stock, end of period (in shares) at Jun. 30, 2020														19,735
Treasury stock, end of period at Jun. 30, 2020														$ (177)
Balance, beginning of period (in shares) at Mar. 31, 2020					55,589,100
Balance, beginning of period at Mar. 31, 2020	1,647,482				$ 56			610,579			1,106,285					(69,261)
Treasury stock, beginning of period (in shares) at Mar. 31, 2020														19,735
Treasury stock, beginning period at Mar. 31, 2020														$ (177)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures [Abstract]
Stock units vested (in shares)						18,649
Stock units withheld for employee taxes		$ (1,169)							$ (1,169)
Stock units withheld for employee taxes (in shares)						(5,522)
Proceeds from stock options exercises	10,116							10,116
Proceeds from stock options exercises (in shares)					223,724
Stock-based compensation expense	11,153							11,153
Foreign currency translation adjustments, net of tax	12,442															12,442
Change in unrealized gains and losses on cash flow hedges, net of tax	6,446															6,446
Net income	$ 66,624										66,624
Balance, end of period (in shares) at Jun. 30, 2020	55,825,951				55,825,951
Balance, end of period at Jun. 30, 2020	$ 1,753,094				$ 56			$ 630,679			$ 1,172,909					$ (50,373)
Treasury stock, end of period (in shares) at Jun. 30, 2020														19,735
Treasury stock, end of period at Jun. 30, 2020														$ (177)

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 152,189	$ 119,531
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	30,166	21,228
Operating lease right-of-use assets amortization expense	33,834	25,732
Bad debt expense	3,174	167
Deferred taxes	2,971	(1,193)
Stock-based compensation expense	31,320	37,553
Other	4,458	3,938
Changes in assets and liabilities:
Trade receivables and contract assets	(11,842)	(75,332)
Prepaid and other assets	1,216	1,690
Accounts payable	633	(2,069)
Accrued expenses and other liabilities	(5,835)	(42,075)
Operating lease liabilities	(30,857)	(25,705)
Income taxes payable	(2,016)	(19,638)
Net cash provided by operating activities	209,411	43,827
Cash flows from investing activities:
Purchases of property and equipment	(40,524)	(25,025)
Purchases of short-term investments	(60,000)	0
Acquisition of business, net of cash acquired (Note 2)	(12,573)	(16,240)
Purchases of non-marketable securities	(20,500)	(5,000)
Other investing activities, net	26	(1,180)
Net cash used in investing activities	(133,571)	(47,445)
Cash flows from financing activities:
Proceeds from stock option exercises	17,144	22,415
Payments of withholding taxes related to net share settlements of restricted stock units	(15,899)	(13,084)
Payment of contingent consideration for previously acquired business	(7,869)	(1,104)
Other financing activities, net	(24)	(19)
Net cash (used in)/provided by financing activities	(6,648)	8,208
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(11,999)	2,248
Net increase in cash, cash equivalents and restricted cash	57,193	6,838
Cash, cash equivalents and restricted cash, beginning of period	937,688	771,711
Cash, cash equivalents and restricted cash, end of period	$ 994,881	$ 778,549

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOW (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 993,724	$ 936,552
Total restricted cash	1,157	1,136
Total cash, cash equivalents, restricted cash and restricted cash equivalents	994,881	937,688
Other noncurrent assets
Restricted cash	$ 1,157	$ 1,136

BUSINESS AND SUMMARY OF SIGNIFI

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
BUSINESS AND SUMMARY OF 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. Basis of Presentation — The accompanying unaudited condensed consolidated financial statements of EPAM have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP” or “U.S. GAAP”) and Article 10 of Regulation S-X under the Securities Exchange Act of 1934, as amended. The unaudited condensed consolidated financial statements include the financial statements of EPAM Systems, Inc. and its subsidiaries with all intercompany balances and transactions eliminated. These unaudited condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company’s audited consolidated financial statements and the notes thereto for the year ended December 31, 2019 included in its Annual Report on Form 10-K. The preparation of these condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in these condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates, and such differences may be material to the condensed consolidated financial statements. Operating results for the interim periods are not necessarily indicative of results that may be expected to occur for the entire year. In management’s opinion, all adjustments considered necessary for a fair presentation of the accompanying unaudited condensed consolidated financial statements have been included, and all adjustments are of a normal and recurring nature. As previously disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, certain amounts recorded in the prior-period consolidated statement 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. 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, changes in stockholders’ equity and cash flows. Measurement of Credit Losses on Financial Instruments — In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments in this update changed how companies measure and recognize credit impairment for many financial assets. The new 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. The Company adopted Topic 326, effective January 1, 2020, using a modified-retrospective approach through a cumulative effect adjustment to retained earnings as of the beginning of the period of adoption. As a result of the adoption of Topic 326, the Company recorded an immaterial reduction to its allowance for doubtful accounts for trade receivables and contract assets . 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.

ACQUISITION

ACQUISITION	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
ACQUISITION	ACQUISITION 2020 Acquisition — During the six months ended June 30, 2020, the Company completed one acquisition with a purchase price of $14,663 including contingent consideration with an acquisition-date fair value of $4,042. The Company committed to making contingent consideration payments with a maximum amount payable of $16,582 subject to attainment of specified performance targets in the first and second calendar years after the acquisition date. This acquisition increased EPAM’s software an d service capabilities in financial services as well as added $6,300 of intangible assets, consisting mainly of customer relationships. Revenues generated by this acquisition totaled $1,190 and $2,233 during the three and six months ended June 30, 2020, respectively. P ro forma results of operations have not been presented because the effect of the acquisition on the Company’s condensed consolidated financial statements was not material. test IO — During the second quarter of 2020, the Company finalized the fair value of the assets acquired and liabilities assumed in the acquisition of test IO. During 2020, the Company recorded insignificant purchase price adjustments to various accounts with corresponding net decreases to goodwill of $226. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of acquisition as updated for any changes as of June 30, 2020 for test IO: test IO Cash and cash equivalents $ 663 Trade receivables and contract assets 621 Prepaid and other current assets 150 Goodwill 11,926 Intangible assets 6,219 Property and equipment and other noncurrent assets 305 Total assets acquired $ 19,884 Accounts payable, accrued expenses and other current liabilities $ 993 Other noncurrent liabilities 1,568 Total liabilities assumed $ 2,561 Net assets acquired $ 17,323

GOODWILL

GOODWILL	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL	GOODWILL Goodwill by reportable segment was as follows: North America Europe Russia Total Balance as of January 1, 2020 $ 113,426 $ 80,873 $ 744 $ 195,043 test IO purchase accounting adjustment 863 (1,089) — (226) Other 2019 acquisitions purchase accounting adjustments 373 191 35 599 2020 Acquisition 6,293 — — 6,293 Effect of net foreign currency exchange rate changes (177) (2,460) (33) (2,670) Balance as of June 30, 2020 $ 120,778 $ 77,515 $ 746 $ 199,039

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The Company carries certain assets and liabilities at fair value on a recurring basis on its consolidated balance sheets. The following tables present the fair values of the Company’s financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2020 and December 31, 2019: As of June 30, 2020 Balance Level 1 Level 2 Level 3 Foreign exchange derivative assets $ 932 $ — $ 932 $ — Total assets measured at fair value on a recurring basis $ 932 $ — $ 932 $ — Foreign exchange derivative liabilities $ 3,035 $ — $ 3,035 $ — Contingent consideration 4,705 — — 4,705 Total liabilities measured at fair value on a recurring basis $ 7,740 $ — $ 3,035 $ 4,705 As of December 31, 2019 Balance Level 1 Level 2 Level 3 Foreign exchange derivative assets $ 1,910 $ — $ 1,910 $ — Total assets measured at fair value on a recurring basis $ 1,910 $ — $ 1,910 $ — Foreign exchange derivative liabilities $ 243 $ — $ 243 $ — Contingent consideration 10,495 — — 10,495 Total liabilities measured at fair value on a recurring basis $ 10,738 $ — $ 243 $ 10,495 The foreign exchange derivatives are valued using pricing models and discounted cash flow methodologies based on observable foreign exchange data at the measurement date. See Note 5 “Derivative Financial Instruments” in the condensed consolidated interim financial statements for additional information regarding derivative financial instruments. The fair value of the contingent consideration was determined using a probability-weighted expected return method and is based on the expected future payments to be made to the sellers of the acquired businesses in accordance with the provisions outlined in the respective purchase agreements. Although there is significant judgment involved, the Company believes its estimates and assumptions are reasonable. In determining fair value, the Company considered a variety of factors, including future performance of the acquired businesses using financial projections developed by the Company and market risk assumptions that were derived for revenue growth and earnings before interest and taxes. The Company estimated future payments using the earnout formula and performance targets specified in the purchase agreements and adjusted those estimates to reflect the probability of their achievement. Those weighted-average estimated future payments were then discounted to present value using a rate based on the weighted-average cost of capital of guideline companies. The discount rate used to determine the fair value of contingent consideration for the 2020 Acquisition was 17.5%. Changes in financial projections, market risk assumptions, discount rates or probability assumptions related to achieving the various earnout criteria would result in a change in the fair value of the recorded contingent liabilities. Such changes, if any, are recorded within Interest and other income, net in the Company’s consolidated statement of income and comprehensive income. A reconciliation of the beginning and ending balances of Level 3 acquisition-related contingent consideration using significant unobservable inputs for the six months ended June 30, 2020 is as follows: Amount Contingent consideration liabilities as of January 1, 2020 $ 10,495 Payment of contingent consideration for previously acquired business (7,869) Acquisition date fair value of contingent consideration — 2020 Acquisition (Note 2) 4,042 Changes in fair value of contingent consideration included in Interest and other income, net (1,438) Effect of net foreign currency exchange rate changes (525) Contingent consideration liabilities as of June 30, 2020 $ 4,705 Financial Assets and Liabilities Not Measured at Fair Value on a Recurring Basis Estimates of fair value of financial instruments not carried at fair value on a recurring basis on the Company’s consolidated balance sheets are generally subjective in nature, and are determined as of a specific point in time based on the characteristics of the financial instruments and relevant market information. The generally short maturities of certain assets and liabilities result in a number of assets and liabilities for which fair value equals or closely approximates the amount recorded on the Company’s consolidated balance sheets. The following tables present the estimated fair values of the Company’s financial assets and liabilities not measured at fair value on a recurring basis as of the dates indicated: Fair Value Hierarchy Balance Estimated Fair Value Level 1 Level 2 Level 3 June 30, 2020 Financial Assets: Cash equivalents: Money market funds $ 189,873 $ 189,873 $ 189,873 $ — $ — Total cash equivalents $ 189,873 $ 189,873 $ 189,873 $ — $ — Restricted cash $ 1,157 $ 1,157 $ 1,157 $ — $ — Time deposits $ 60,025 $ 60,025 $ — $ 60,025 $ — Employee loans $ 1,491 $ 1,491 $ — $ — $ 1,491 Financial Liabilities: Borrowings under the 2017 Credit Facility $ 25,007 $ 25,007 $ — $ 25,007 $ — Fair Value Hierarchy Balance Estimated Fair Value Level 1 Level 2 Level 3 December 31, 2019 Financial Assets: Cash equivalents: Money market funds $ 407,817 $ 407,817 $ 407,817 $ — $ — Time deposits 10,002 10,002 — 10,002 — Total cash equivalents $ 417,819 $ 417,819 $ 407,817 $ 10,002 $ — Restricted cash $ 1,136 $ 1,136 $ 1,136 $ — $ — Employee loans $ 2,434 $ 2,434 $ — $ — $ 2,434 Financial Liabilities: Borrowings under the 2017 Credit Facility $ 25,017 $ 25,017 $ — $ 25,017 $ — Non-Marketable Securities Without Readily Determinable Fair Values The Company holds investments in equity securities that do not have readily determinable fair values. These investments are recorded at cost and are remeasured to fair value based on certain observable price changes or impairment events as they occur. The carrying amount of these investments was $25,000 and $5,750 as of June 30, 2020 and December 31, 2019, respectively and is classified as Other noncurrent assets in the Company’s condensed consolidated balance sheets.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS In the normal course of business, the Company uses derivative financial instruments to manage the risk of fluctuations in foreign currency exchange rates. The Company has a hedging program whereby it enters into a series of foreign exchange forward contracts with durations of twelve months or less that are designated as cash flow hedges of forecasted Russian ruble, Polish zloty and Indian rupee transactions. As of June 30, 2020, all of the Company’s foreign exchange forward contracts were designated as hedges and there is no financial collateral (including cash collateral) required to be posted by the Company related to the foreign exchange forward contracts. The fair value of derivative instruments on the Company’s consolidated balance sheets as of June 30, 2020 and December 31, 2019 were as follows: As of June 30, 2020 As of December 31, 2019 Balance Sheet Classification Asset Derivatives Liability Derivatives Asset Derivatives Liability Derivatives Foreign exchange forward contracts - Prepaid expenses and other current assets $ 932 $ 1,910 Accrued expenses and other current liabilities $ 3,035 $ 243 The Company records changes in the fair value of its cash flow hedges in accumulated other comprehensive loss in the consolidated balance sheets 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 related cash flow 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 changes in the fair value of foreign currency derivative instruments in our unaudited condensed consolidated statements of income and comprehensive income for the three and six months ended June 30, 2020 and 2019 were as follows: Three Months Ended Six Months Ended 2020 2019 2020 2019 Foreign exchange forward contracts - Designated as hedging instruments: Net gain/(loss) in fair value recognized in accumulated other comprehensive loss $ 8,317 $ 1,984 $ (3,770) $ 5,983 Net (loss)/gain reclassified from accumulated other comprehensive loss into cost of revenues (exclusive of depreciation and amortization) $ (1,851) $ 342 $ (2,511) $ (110)

LEASES

LEASES	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
LEASES	LEASESThe Company leases office space, corporate apartments, office equipment, and vehicles. Many of the Company’s leases contain variable payments including changes in base rent and charges for common area maintenance or other miscellaneous expenses. Due to this variability, the cash flows associated with these variable payments are not included in the minimum lease payments used in determining the right-of-use assets and associated lease liabilities and are recognized in the period in which the obligation for such payments is incurred. The Company’s leases have remaining lease terms ranging from 0.1 years to 10.9 years. Certain lease agreements, mainly for office space, include options to extend or terminate the lease before the expiration date. The Company considers such options when determining the lease term when it is reasonably certain that the Company will exercise that option. The Company leases and subleases a portion of its office space to third parties. Lease income and sublease income were immaterial for the three and six months ended June 30, 2020 and 2019. During the three and six months ended June 30, 2020 and 2019, the components of lease expense were as follows: Three Months Ended Six Months Ended Income Statement Classification 2020 2019 2020 2019 Operating lease cost Selling, general and administrative expenses $ 18,851 $ 15,196 $ 37,714 $ 28,915 Variable lease cost Selling, general and administrative expenses 579 1,999 3,214 4,096 Short-term lease cost Selling, general and administrative expenses 269 1,006 809 1,904 Total lease cost $ 19,699 $ 18,201 $ 41,737 $ 34,915 Supplemental cash flow information related to leases for the three and six months ended June 30, 2020 and 2019 was as follows: Three Months Ended Six Months Ended 2020 2019 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 16,481 $ 14,105 $ 33,372 $ 28,801 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 11,676 $ 40,722 $ 42,928 $ 53,547 Non-cash net (decrease)/increase due to lease modifications: Operating lease right-of-use assets $ (8,566) $ 8,324 $ (3,982) $ 3,150 Operating lease liabilities $ (8,562) $ 8,358 $ (3,989) $ 3,252 Weighted average remaining lease term and discount rate as of June 30, 2020 and 2019 were as follows: As of June 30, 2020 As of June 30, 2019 Weighted average remaining lease term, in years: Operating leases 6.0 6.2 Weighted average discount rate: Operating leases 3.2 % 3.6 % As of June 30, 2020, operating lease liabilities will mature as follows: Year ending December 31, Lease Payments 2020 (excluding six months ended June 30, 2020) $ 34,183 2021 59,786 2022 44,318 2023 32,080 2024 27,677 Thereafter 67,913 Total lease payments 265,957 Less: imputed interest (23,315) Total $ 242,642 The Company had committed to payments of $2,281 related to operating lease agreements that had not yet commenced as of June 30, 2020. These operating leases will commence on various dates during 2020 with lease terms ranging from 1.4 to 5.8 years. The Company did not have any material finance lease agreements that had not yet commenced.

LONG-TERM DEBT

LONG-TERM DEBT	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT Revolving Line of Credit — On May 24, 2017, the Company entered into an 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 borrowing capacity 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 equivalent in British pounds sterling, Canadian dollars, euros or 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, and (c) the Daily LIBOR Rate, plus 1.0%. As of June 30, 2020, 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 June 30, 2020, 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 As of Outstanding debt $ 25,000 $ 25,000 Interest rate 1.2 % 2.8 % Irrevocable standby letters of credit $ — $ 303 Available borrowing capacity $ 275,000 $ 274,697 Current maximum borrowing capacity $ 300,000 $ 300,000

REVENUES

REVENUES	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
REVENUES	REVENUES Disaggregation of Revenues The following tables present the disaggregation of the Company’s revenues by customer location, including a reconciliation of the disaggregated revenues with the reportable segments (Note 13 “Segment Information”) for the periods indicated: Three Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Customer Locations North America $ 370,693 $ 10,835 $ 408 $ 381,936 Europe 11,195 199,866 3 211,064 CIS 2,236 4 19,838 22,078 APAC 705 16,600 — 17,305 Revenues $ 384,829 $ 227,305 $ 20,249 $ 632,383 Six Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Customer Locations North America $ 748,477 $ 21,254 $ 2,035 $ 771,766 Europe 21,527 412,588 6 434,121 CIS 4,790 16 42,132 46,938 APAC 1,137 29,780 — 30,917 Revenues $ 775,931 $ 463,638 $ 44,173 $ 1,283,742 Three Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Customer Locations North America $ 323,221 $ 11,551 $ 16 $ 334,788 Europe 5,219 172,027 99 177,345 CIS 2,005 — 23,086 25,091 APAC 580 13,783 — 14,363 Revenues $ 331,025 $ 197,361 $ 23,201 $ 551,587 Six Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Customer Locations North America $ 626,966 $ 24,442 $ 32 $ 651,440 Europe 9,966 340,647 240 350,853 CIS 3,744 13 39,508 43,265 APAC 1,038 26,324 — 27,362 Revenues $ 641,714 $ 391,426 $ 39,780 $ 1,072,920 The following tables present the disaggregation of the Company’s revenues by industry vertical, including a reconciliation of the disaggregated revenues with the reportable segments (Note 13 “Segment Information”) for the periods indicated: Three Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Industry Verticals Business Information & Media $ 81,481 $ 58,338 $ 439 $ 140,258 Financial Services 47,687 66,655 13,633 127,975 Software & Hi-Tech 100,801 18,165 519 119,485 Travel & Consumer 52,193 51,253 3,824 107,270 Life Sciences & Healthcare 61,776 7,069 39 68,884 Emerging Verticals 40,891 25,825 1,795 68,511 Revenues $ 384,829 $ 227,305 $ 20,249 $ 632,383 Six Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Industry Verticals Business Information & Media $ 161,701 $ 116,484 $ 799 $ 278,984 Financial Services 95,555 134,249 29,814 259,618 Software & Hi-Tech 202,538 36,311 2,485 241,334 Travel & Consumer 106,917 112,320 7,563 226,800 Life Sciences & Healthcare 123,387 14,688 48 138,123 Emerging Verticals 85,833 49,586 3,464 138,883 Revenues $ 775,931 $ 463,638 $ 44,173 $ 1,283,742 Three Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Industry Verticals Business Information & Media $ 62,340 $ 35,691 $ 104 $ 98,135 Financial Services 43,517 58,879 18,009 120,405 Software & Hi-Tech 85,600 19,440 478 105,518 Travel & Consumer 48,178 56,175 2,761 107,114 Life Sciences & Healthcare 54,287 4,907 4 59,198 Emerging Verticals 37,103 22,269 1,845 61,217 Revenues $ 331,025 $ 197,361 $ 23,201 $ 551,587 Six Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Industry Verticals Business Information & Media $ 124,701 $ 68,222 $ 244 $ 193,167 Financial Services 81,911 120,714 31,041 233,666 Software & Hi-Tech 164,721 39,810 918 205,449 Travel & Consumer 95,178 111,377 4,885 211,440 Life Sciences & Healthcare 104,443 9,463 66 113,972 Emerging Verticals 70,760 41,840 2,626 115,226 Revenues $ 641,714 $ 391,426 $ 39,780 $ 1,072,920 The following tables present the disaggregation of the Company’s revenues by contract type including a reconciliation of the disaggregated revenues with the Company’s reportable segments (Note 13 “Segment Information”) for the periods indicated: Three Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Contract Types Time-and-material $ 348,715 $ 192,173 $ 13,972 $ 554,860 Fixed-price 33,855 32,253 6,259 72,367 Licensing 1,958 545 9 2,512 Other revenues 301 2,334 9 2,644 Revenues $ 384,829 $ 227,305 $ 20,249 $ 632,383 Six Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Contract Types Time-and-material $ 705,978 $ 382,493 $ 27,568 $ 1,116,039 Fixed-price 65,710 77,508 15,080 158,298 Licensing 3,728 707 1,467 5,902 Other revenues 515 2,930 58 3,503 Revenues $ 775,931 $ 463,638 $ 44,173 $ 1,283,742 Three Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Contract Types Time-and-material $ 300,326 $ 167,581 $ 12,047 $ 479,954 Fixed-price 29,681 29,204 10,943 69,828 Licensing 624 142 196 962 Other revenues 394 434 15 843 Revenues $ 331,025 $ 197,361 $ 23,201 $ 551,587 Six Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Contract Types Time-and-material $ 585,051 $ 335,794 $ 23,319 $ 944,164 Fixed-price 54,421 54,450 16,230 125,101 Licensing 1,460 540 202 2,202 Other revenues 782 642 29 1,453 Revenues $ 641,714 $ 391,426 $ 39,780 $ 1,072,920 Timing of Revenue Recognition The following tables present the timing of revenue recognition for the periods indicated: Three Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Timing of Revenue Recognition Transferred over time $ 383,573 $ 227,073 $ 20,240 $ 630,886 Transferred at a point of time 1,256 232 9 1,497 Revenues $ 384,829 $ 227,305 $ 20,249 $ 632,383 Six Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Timing of Revenue Recognition Transferred over time $ 773,383 $ 463,244 $ 42,708 $ 1,279,335 Transferred at a point of time 2,548 394 1,465 4,407 Revenues $ 775,931 $ 463,638 $ 44,173 $ 1,283,742 Three Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Timing of Revenue Recognition Transferred over time $ 330,819 $ 197,255 $ 23,201 $ 551,275 Transferred at a point of time 206 106 — 312 Revenues $ 331,025 $ 197,361 $ 23,201 $ 551,587 Six Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Timing of Revenue Recognition Transferred over time $ 641,104 $ 391,273 $ 39,780 $ 1,072,157 Transferred at a point of time 610 153 — 763 Revenues $ 641,714 $ 391,426 $ 39,780 $ 1,072,920 Performance obligations satisfied in prior periods led to a reduction of $3,669 of revenues during the three months ended June 30, 2020 and an increase of $4,182 of revenues during the six months ended June 30, 2020. The Company recognized revenues associated with performance obligations satisfied in previous periods of $7,693 and $4,119 during the three and six months ended June 30, 2019, respectively. The following table includes the estimated revenues expected to be recognized in the future related to performance obligations that are partially or fully unsatisfied as of June 30, 2020. The Company applies a practical expedient and does not disclose the value of unsatisfied performance obligations for contracts that (i) have an original expected duration of one year or less and (ii) contracts for which it recognizes revenues at the amount to which it has the right to invoice for services provided: Less than 1 year 1 Year 2 Years 3 Years Total Contract Type Fixed-price $ 15,395 $ 546 $ — $ — $ 15,941 The Company applies a practical expedient and does not disclose the amount of the transaction price allocated to the remaining performance obligations nor provide an explanation of when the Company expects to recognize that amount as revenue for certain variable consideration. Contract Balances The following table provides information on the classification of contract assets and liabilities in the condensed consolidated balance sheets: As of As of Contract assets included in Trade receivables and contract assets $ 12,353 $ 14,320 Contract liabilities included in Accrued expenses and other current liabilities $ 11,461 $ 9,132 Contract assets have not materially changed from December 31, 2019. Contract liabilities comprise amounts collected from the Company’s customers for revenues not yet earned. Such amounts are anticipated to be recorded as revenues when services are performed in subsequent periods. Contract liabilities have not materially changed from December 31, 2019. During the three and six months ended June 30, 2020, the Company recognized $1,325 and $7,862 of revenues, respectively, that were included in Accrued expenses and other current liabilities at December 31, 2019. During the three and six months ended June 30, 2019, the Company recognized $610 and $3,661 of revenues, respectively, that were included in Accrued expenses and other current liabilities at December 31, 2018.

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	6 Months Ended
	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION The following table summarizes the components of stock-based compensation expense recognized in the Company’s condensed consolidated statements of income and comprehensive income for the periods indicated: Three Months Ended Six Months Ended 2020 2019 2020 2019 Cost of revenues (exclusive of depreciation and amortization) $ 8,958 $ 7,480 $ 12,942 $ 20,261 Selling, general and administrative expenses 10,481 8,217 18,378 17,292 Total $ 19,439 $ 15,697 $ 31,320 $ 37,553 Stock Options Stock option activity under the Company’s plans is set forth below: Number of Weighted Average Aggregate Weighted Average Options outstanding at January 1, 2020 3,322,930 $ 50.85 Options granted 147,351 $ 176.21 Options exercised (441,199) $ 39.12 Options forfeited/cancelled (9,137) $ 117.40 Options outstanding at June 30, 2020 3,019,945 $ 58.48 $ 584,445 4.7 Options vested and exercisable at June 30, 2020 2,641,633 $ 45.82 $ 544,682 4.1 Options expected to vest at June 30, 2020 348,999 $ 145.93 $ 37,021 8.6 As of June 30, 2020, $17,196 of total remaining unrecognized stock-based compensation cost related to unvested stock options, net of estimated forfeitures, is expected to be recognized over the weighted-average remaining requisite service period of 2.9 years. Restricted Stock and Restricted Stock Units Service-Based Awards The table below summarizes activity related to the Company’s equity-classified and liability-classified service-based awards for the six months ended June 30, 2020: Equity-Classified Restricted Stock Equity-Classified Equity-Settled Restricted Stock Units Liability-Classified Cash-Settled Restricted Stock Units Number of Shares Weighted Average Grant Date Number of Shares Weighted Average Grant Date Number of Shares Weighted Average Grant Date Unvested service-based awards outstanding at January 1, 2020 9,791 $ 162.96 758,785 $ 122.48 242,288 $ 105.40 Awards granted — $ — 251,864 $ 180.18 59,770 $ 180.37 Awards vested — $ — (294,872) $ 106.73 (118,777) $ 89.34 Awards forfeited/cancelled — $ — (28,126) $ 137.76 (3,456) $ 108.89 Unvested service-based awards outstanding at June 30, 2020 9,791 $ 162.96 687,651 $ 149.74 179,825 $ 140.86 As of June 30, 2020, $1,138 of total remaining unrecognized stock-based compensation cost related to service-based equity-classified restricted stock is expected to be recognized over the weighted-average remaining requisite service period of 2.2 years. As of June 30, 2020, $83,125 of total remaining unrecognized stock-based compensation cost related to service-based equity-classified restricted stock units (“RSUs”), net of estimated forfeitures, is expected to be recognized over the weighted-average remaining requisite service period of 2.8 years. During the six months ended June 30, 2020, 19,201 equity-classified RSUs were granted in connection with a 2020 acquisition of a business. See Note 2 “Acquisitions” in the condensed consolidated interim financial statements for additional information regarding business acquisitions. During the first quarter of 2020, in connection with a 2019 acquisition of a business, the Company formally issued 5,793 equity-classified RSUs. As of June 30, 2020, $32,302 of total remaining unrecognized stock-based compensation cost related to service-based liability-classified cash-settled RSUs, net of estimated forfeitures, is expected to be recognized over the weighted-average remaining requisite service period of 2.5 years. During the six months ended June 30, 2020, 9,736 liability-classified cash-settled RSUs were granted in connection with an acquisition of a business. See Note 2 “Acquisitions” in the condensed consolidated interim financial statements for additional information regarding business acquisitions. The liability associated with the service-based liability-classified RSUs as of June 30, 2020 and December 31, 2019, was $9,122 and $21,902, respectively, and was classified as Accrued compensation and benefits expenses in the condensed consolidated balance sheets. Performance-Based Awards The table below summarizes activity related to the Company’s equity-classified performance-based awards for the six months ended June 30, 2020: Equity-Classified Equity-Settled Restricted Stock Equity-Classified Equity-Settled Restricted Stock Units Number of Shares Weighted Average Grant Date Number of Shares Weighted Average Grant Date Unvested performance-based awards outstanding at January 1, 2020 9,393 $ 165.87 — $ — Awards granted — $ — 24,836 $ 177.81 Unvested performance-based awards outstanding at June 30, 2020 9,393 $ 165.87 24,836 $ 177.81 As of June 30, 2020, $1,236 of total remaining unrecognized stock-based compensation cost related to performance-based restricted stock is expected to be recognized over the weighted-average remaining requisite service period of 3.2 years. During the first quarter of 2020, in connection with a 2019 acquisition of a business, the Company formally issued 24,836 performance-based equity-classified RSUs. As of June 30, 2020, $2,569 of total remaining unrecognized stock-based compensation cost related to performance-based equity-classified RSUs is expected to be recognized over the weighted-average remaining requisite service period of 2.9 years. During the first quarter of 2020, the Company agreed to issue equity-classified RSUs at future dates worth up to $2,171 in connection with an acquisition of a business. The number of awards to be issued is subject to attainment of specified performance targets in the 2 years after the acquisition date as well as the Company’s stock price at the time of formal issuance. The awards require continued service and vest over 3 years from the date of acquisition.

INCOME TAXES

INCOME TAXES	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES In determining its interim provision for income taxes, the Company uses an estimated annual effective tax rate, which is based on expected annual profit before tax, statutory tax rates and tax planning opportunities available in the various jurisdictions in which the Company operates. Certain significant or unusual items are separately recognized in the quarter in which they occur and can be a source of variability in the effective tax rates from quarter to quarter. The Company’s worldwide effective tax rates for the three months ended June 30, 2020 and 2019 were 12.4% and 16.6%, respectively, and 11.8% and 11.3% during the six months ended June 30, 2020 and 2019, respectively.

EARNINGS PER SHARE

EARNINGS PER SHARE	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHAREBasic earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of shares of common stock outstanding during the period. For purposes of computing basic earnings per share, any nonvested shares of restricted stock that have been issued by the Company and are contingently returnable to the Company are excluded from the weighted-average number of shares of common stock outstanding during the period. Diluted earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of shares of common stock outstanding during the period increased to include 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 equity-settled RSUs. The dilutive effect of potentially dilutive securities is reflected in diluted earnings per share by application of the treasury stock method. The following table sets forth the computation of basic and diluted earnings per share of common stock as follows: Three Months Ended Six Months Ended 2020 2019 2020 2019 Numerator for basic and diluted earnings per share: Net income $ 66,624 $ 58,777 $ 152,189 $ 119,531 Numerator for basic and diluted earnings per share $ 66,624 $ 58,777 $ 152,189 $ 119,531 Denominator: Weighted average common shares for basic earnings per share 55,700,706 54,681,959 55,493,727 54,464,753 Net effect of dilutive stock options, restricted stock units and restricted stock awards 2,545,525 2,932,325 2,700,674 2,961,810 Weighted average common shares for diluted earnings per share 58,246,231 57,614,284 58,194,401 57,426,563 Net income per share: Basic $ 1.20 $ 1.07 $ 2.74 $ 2.19 Diluted $ 1.14 $ 1.02 $ 2.62 $ 2.08 The number of shares underlying equity-based awards that were excluded from the calculation of diluted earnings per share as their effect would be anti-dilutive was 146,732 and 77,925 during the three and six months ended June 30, 2020, respectively. The number of shares underlying equity-based awards that were excluded from the calculation of diluted earnings per share as their effect would be anti-dilutive was 168,451 and 97,327 during the three and six months ended June 30, 2019, respectively.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Indemnification Obligations — In the normal course of business, the Company is a party to a variety of agreements under which it may be obligated to indemnify the other party for certain matters. These obligations typically arise in contracts where the Company customarily agrees to hold the other party harmless against losses arising from a breach of representations or covenants for certain matters, infringement of third party intellectual property rights, data privacy violations, and certain tortious conduct in the course of providing services. The duration of these indemnifications varies, and in certain cases, is indefinite. The Company is unable to reasonably estimate the maximum potential amount of future payments under these or similar agreements due to the unique facts and circumstances of each agreement and the fact that certain indemnifications provide for no limitation to the maximum potential future payments under the indemnification. Management is not aware of any such matters that would have a material effect on the condensed consolidated financial statements of the Company. Litigation — From time to time, the Company is involved in litigation, claims or other contingencies arising in the ordinary course of business. The Company accrues a liability when a loss is considered probable and the amount can be reasonably estimated. When a material loss contingency is reasonably possible but not probable, the Company does not record a liability, but instead discloses the nature and the amount of the claim, and an estimate of the loss or range of loss, if such an estimate can be made. Legal fees are expensed as incurred. In the opinion of management, the outcome of any existing claims and legal or regulatory proceedings, if decided adversely, is not expected to have a material effect on the Company’s business, financial condition, results of operations or cash flows. Building Acquisition Commitments — During the year ended December 31, 2019, the Company entered into an agreement to purchase office space in Ukraine intended to support the global delivery center in that country. The agreement is subject to completion of construction and other ordinary closing conditions. As of June 30, 2020, the Company has committed to making future payments totaling approximately $36,900 including VAT to the sellers upon transfer of the building.

SEGMENTS INFORMATION

SEGMENTS INFORMATION	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION The Company determines its business segments and reports segment information in accordance with how the Company’s chief operating decision maker (“CODM”) organizes the segments to evaluate performance, allocate resources and make business decisions. Segment results are based on the segment’s revenues and operating profit, where segment operating profit is defined as income from operations before unallocated costs. Expenses included in segment operating profit consist principally of direct selling and delivery costs as well as an allocation of certain shared services expenses. Certain corporate expenses are not allocated to specific segments as these expenses are not controllable at the segment level. Such expenses include certain types of professional fees, non-corporate taxes, compensation to non-employee directors and certain other general and administrative expenses, including compensation of specific groups of non-production employees. In addition, the Company does not allocate amortization of intangible assets acquired through business combinations, goodwill and other asset impairment charges, stock-based compensation expenses, acquisition-related costs and certain other one-time charges. These unallocated amounts are combined with total segment operating profit to arrive at consolidated income from operations as reported below in the reconciliation of segment operating profit to consolidated income before provision for income taxes. Additionally, management has determined that it is not practical to allocate identifiable assets by segment since such assets are used interchangeably among the segments. The Company manages its business primarily based on the managerial responsibility for its client base and market. As managerial responsibility for a particular customer relationship generally correlates with the customer’s geographic location, there is a high degree of similarity between customer locations and the geographic boundaries of the Company’s reportable segments. In some cases, managerial responsibility for a particular customer is assigned to a management team in another region and is usually based on the strength of the relationship between customer executives and particular members of EPAM’s senior management team. In such cases, the customer’s activity would be reported through the management team’s reportable segment. During the fourth quarter of 2019, the Company changed its management reporting of segment revenue to exclude other income. Prior year amounts presented below have been changed to conform to the new presentation. Revenues from external customers and operating profit/(loss), before unallocated expenses, by reportable segment for the three and six months ended June 30, 2020 and 2019, were as follows: Three Months Ended Six Months Ended 2020 2019 2020 2019 Segment revenues: North America $ 384,829 $ 331,025 $ 775,931 $ 641,714 Europe 227,305 197,361 463,638 391,426 Russia 20,249 23,201 44,173 39,780 Total segment revenues $ 632,383 $ 551,587 $ 1,283,742 $ 1,072,920 Segment operating profit/(loss): North America $ 82,752 $ 69,347 $ 161,679 $ 133,804 Europe 34,426 27,679 66,205 59,464 Russia (5,645) 5,652 (5,126) 6,241 Total segment operating profit $ 111,533 $ 102,678 $ 222,758 $ 199,509 Intersegment transactions were excluded from the above on the basis that they are neither included in the measure of a segment’s profit and loss results, nor considered by the CODM during the review of segment results. There were no customers that accounted for more than 10% of total segment revenues during the three and six months ended June 30, 2020 and 2019. Reconciliation of segment operating profit to consolidated income before provision for income taxes is presented below: Three Months Ended Six Months Ended 2020 2019 2020 2019 Total segment operating profit: $ 111,533 $ 102,678 $ 222,758 $ 199,509 Unallocated amounts: Stock-based compensation expense (19,439) (15,697) (31,320) (37,553) Amortization of intangibles assets (2,994) (2,601) (6,129) (4,739) Other acquisition-related expenses (148) (850) (616) (1,361) Other unallocated expenses (5,526) (10,648) (13,758) (18,316) Income from operations 83,426 72,882 170,935 137,540 Interest and other income, net 1,817 1,190 4,203 4,266 Foreign exchange loss (9,167) (3,562) (2,643) (7,046) Income before provision for income taxes $ 76,076 $ 70,510 $ 172,495 $ 134,760 Geographic Area Information Long-lived assets include property and equipment, net of accumulated depreciation and amortization, and management has determined that it is not practical to allocate these assets by segment since such assets are used interchangeably among the segments. Physical locations and values of the Company’s long-lived assets are presented below: As of As of Belarus $ 73,989 $ 75,984 Ukraine 29,577 24,652 United States 17,697 15,637 Russia 15,249 17,980 India 6,553 7,443 Poland 4,803 5,029 Hungary 4,684 5,201 China 2,621 3,036 Mexico 2,591 2,353 Other 9,595 7,944 Total $ 167,359 $ 165,259 The table below presents information about the Company’s revenues by customer location for the three and six months ended June 30, 2020 and 2019: Three Months Ended Six Months Ended 2020 2019 2020 2019 United States $ 365,004 $ 318,988 $ 735,093 $ 618,668 United Kingdom 82,277 69,042 174,409 134,781 Switzerland 46,537 35,364 93,759 71,597 Netherlands 27,237 21,039 53,146 41,655 Russia 19,448 22,460 41,409 38,352 Germany 19,798 19,622 39,991 38,776 Canada 16,585 15,785 34,505 32,757 Other locations 55,497 49,287 111,430 96,334 Total $ 632,383 $ 551,587 $ 1,283,742 $ 1,072,920

BUSINESS AND SUMMARY OF SIGNI_2

BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Nature of Operations	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.
Basis of Presentation	Basis of Presentation — The accompanying unaudited condensed consolidated financial statements of EPAM have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP” or “U.S. GAAP”) and Article 10 of Regulation S-X under the Securities Exchange Act of 1934, as amended. The unaudited condensed consolidated financial statements include the financial statements of EPAM Systems, Inc. and its subsidiaries with all intercompany balances and transactions eliminated.
Use of Estimates	The preparation of these condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in these condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates, and such differences may be material to the condensed consolidated financial statements. Operating results for the interim periods are not necessarily indicative of results that may be expected to occur for the entire year. In management’s opinion, all adjustments considered necessary for a fair presentation of the accompanying unaudited condensed consolidated financial statements have been included, and all adjustments are of a normal and recurring nature.
Reclassifications	As previously disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, certain amounts recorded in the prior-period consolidated statement 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.
Adoption of New Accounting Standards	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, changes in stockholders’ equity and cash flows. Measurement of Credit Losses on Financial Instruments — In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendments in this update changed how companies measure and recognize credit impairment for many financial assets. The new 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. The Company adopted Topic 326, effective January 1, 2020, using a modified-retrospective approach through a cumulative effect adjustment to retained earnings as of the beginning of the period of adoption. As a result of the adoption of Topic 326, the Company recorded an immaterial reduction to its allowance for doubtful accounts for trade receivables and contract assets . 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.

FAIR VALUE MEASUREMENTS (Polici

FAIR VALUE MEASUREMENTS (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Fair Value of Financial Instruments	The foreign exchange derivatives are valued using pricing models and discounted cash flow methodologies based on observable foreign exchange data at the measurement date. See Note 5 “Derivative Financial Instruments” in the condensed consolidated interim financial statements for additional information regarding derivative financial instruments. The fair value of the contingent consideration was determined using a probability-weighted expected return method and is based on the expected future payments to be made to the sellers of the acquired businesses in accordance with the provisions outlined in the respective purchase agreements. Although there is significant judgment involved, the Company believes its estimates and assumptions are reasonable. In determining fair value, the Company considered a variety of factors, including future performance of the acquired businesses using financial projections developed by the Company and market risk assumptions that were derived for revenue growth and earnings before interest and taxes. The Company estimated future payments using the earnout formula and performance targets specified in the purchase agreements and adjusted those estimates to reflect the probability of their achievement. Those weighted-average estimated future payments were then discounted to present value using a rate based on the weighted-average cost of capital of guideline companies. The discount rate used to determine the fair value of contingent consideration for the 2020 Acquisition was 17.5%. Changes in financial projections, market risk assumptions, discount rates or probability assumptions related to achieving the various earnout criteria would result in a change in the fair value of the recorded contingent liabilities. Such changes, if any, are recorded within Interest and other income, net in the Company’s consolidated statement of income and comprehensive income.
Equity Securities without Readily Determinable Fair Value	These investments are recorded at cost and are remeasured to fair value based on certain observable price changes or impairment events as they occur

DERIVATIVE FINANCIAL INSTRUME_2

DERIVATIVE FINANCIAL INSTRUMENTS (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Reporting of Cash Flow Hedges	The Company records changes in the fair value of its cash flow hedges in accumulated other comprehensive loss in the consolidated balance sheets 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 related cash flow hedge into income.
Reporting of Derivative Activity	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.

INCOME TAXES (Policies)

INCOME TAXES (Policies)	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	In determining its interim provision for income taxes, the Company uses an estimated annual effective tax rate, which is based on expected annual profit before tax, statutory tax rates and tax planning opportunities available in the various jurisdictions in which the Company operates. Certain significant or unusual items are separately recognized in the quarter in which they occur and can be a source of variability in the effective tax rates from quarter to quarter.

ACQUISITION (Tables)

ACQUISITION (Tables)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Fair Value of the Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of acquisition as updated for any changes as of June 30, 2020 for test IO: test IO Cash and cash equivalents $ 663 Trade receivables and contract assets 621 Prepaid and other current assets 150 Goodwill 11,926 Intangible assets 6,219 Property and equipment and other noncurrent assets 305 Total assets acquired $ 19,884 Accounts payable, accrued expenses and other current liabilities $ 993 Other noncurrent liabilities 1,568 Total liabilities assumed $ 2,561 Net assets acquired $ 17,323

GOODWILL (Tables)

GOODWILL (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill By Reportable Segment	Goodwill by reportable segment was as follows: North America Europe Russia Total Balance as of January 1, 2020 $ 113,426 $ 80,873 $ 744 $ 195,043 test IO purchase accounting adjustment 863 (1,089) — (226) Other 2019 acquisitions purchase accounting adjustments 373 191 35 599 2020 Acquisition 6,293 — — 6,293 Effect of net foreign currency exchange rate changes (177) (2,460) (33) (2,670) Balance as of June 30, 2020 $ 120,778 $ 77,515 $ 746 $ 199,039

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the fair values of the Company’s financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2020 and December 31, 2019: As of June 30, 2020 Balance Level 1 Level 2 Level 3 Foreign exchange derivative assets $ 932 $ — $ 932 $ — Total assets measured at fair value on a recurring basis $ 932 $ — $ 932 $ — Foreign exchange derivative liabilities $ 3,035 $ — $ 3,035 $ — Contingent consideration 4,705 — — 4,705 Total liabilities measured at fair value on a recurring basis $ 7,740 $ — $ 3,035 $ 4,705 As of December 31, 2019 Balance Level 1 Level 2 Level 3 Foreign exchange derivative assets $ 1,910 $ — $ 1,910 $ — Total assets measured at fair value on a recurring basis $ 1,910 $ — $ 1,910 $ — Foreign exchange derivative liabilities $ 243 $ — $ 243 $ — Contingent consideration 10,495 — — 10,495 Total liabilities measured at fair value on a recurring basis $ 10,738 $ — $ 243 $ 10,495
Acquisition-Related Contingent Consideration Roll Forward	A reconciliation of the beginning and ending balances of Level 3 acquisition-related contingent consideration using significant unobservable inputs for the six months ended June 30, 2020 is as follows: Amount Contingent consideration liabilities as of January 1, 2020 $ 10,495 Payment of contingent consideration for previously acquired business (7,869) Acquisition date fair value of contingent consideration — 2020 Acquisition (Note 2) 4,042 Changes in fair value of contingent consideration included in Interest and other income, net (1,438) Effect of net foreign currency exchange rate changes (525) Contingent consideration liabilities as of June 30, 2020 $ 4,705
Estimated Fair Values of Financial Assets and Liabilities not Measured at Fair Value on Recurring Basis	The following tables present the estimated fair values of the Company’s financial assets and liabilities not measured at fair value on a recurring basis as of the dates indicated: Fair Value Hierarchy Balance Estimated Fair Value Level 1 Level 2 Level 3 June 30, 2020 Financial Assets: Cash equivalents: Money market funds $ 189,873 $ 189,873 $ 189,873 $ — $ — Total cash equivalents $ 189,873 $ 189,873 $ 189,873 $ — $ — Restricted cash $ 1,157 $ 1,157 $ 1,157 $ — $ — Time deposits $ 60,025 $ 60,025 $ — $ 60,025 $ — Employee loans $ 1,491 $ 1,491 $ — $ — $ 1,491 Financial Liabilities: Borrowings under the 2017 Credit Facility $ 25,007 $ 25,007 $ — $ 25,007 $ — Fair Value Hierarchy Balance Estimated Fair Value Level 1 Level 2 Level 3 December 31, 2019 Financial Assets: Cash equivalents: Money market funds $ 407,817 $ 407,817 $ 407,817 $ — $ — Time deposits 10,002 10,002 — 10,002 — Total cash equivalents $ 417,819 $ 417,819 $ 407,817 $ 10,002 $ — Restricted cash $ 1,136 $ 1,136 $ 1,136 $ — $ — Employee loans $ 2,434 $ 2,434 $ — $ — $ 2,434 Financial Liabilities: Borrowings under the 2017 Credit Facility $ 25,017 $ 25,017 $ — $ 25,017 $ —

DERIVATIVE FINANCIAL INSTRUME_3

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	The fair value of derivative instruments on the Company’s consolidated balance sheets as of June 30, 2020 and December 31, 2019 were as follows: As of June 30, 2020 As of December 31, 2019 Balance Sheet Classification Asset Derivatives Liability Derivatives Asset Derivatives Liability Derivatives Foreign exchange forward contracts - Prepaid expenses and other current assets $ 932 $ 1,910 Accrued expenses and other current liabilities $ 3,035 $ 243
Changes in the Fair Value of Derivative Instruments	The changes in the fair value of foreign currency derivative instruments in our unaudited condensed consolidated statements of income and comprehensive income for the three and six months ended June 30, 2020 and 2019 were as follows: Three Months Ended Six Months Ended 2020 2019 2020 2019 Foreign exchange forward contracts - Designated as hedging instruments: Net gain/(loss) in fair value recognized in accumulated other comprehensive loss $ 8,317 $ 1,984 $ (3,770) $ 5,983 Net (loss)/gain reclassified from accumulated other comprehensive loss into cost of revenues (exclusive of depreciation and amortization) $ (1,851) $ 342 $ (2,511) $ (110)

LEASES (Tables)

LEASES (Tables)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Components of Lease Expenses	During the three and six months ended June 30, 2020 and 2019, the components of lease expense were as follows: Three Months Ended Six Months Ended Income Statement Classification 2020 2019 2020 2019 Operating lease cost Selling, general and administrative expenses $ 18,851 $ 15,196 $ 37,714 $ 28,915 Variable lease cost Selling, general and administrative expenses 579 1,999 3,214 4,096 Short-term lease cost Selling, general and administrative expenses 269 1,006 809 1,904 Total lease cost $ 19,699 $ 18,201 $ 41,737 $ 34,915
Supplemental Cash Flow Information	Supplemental cash flow information related to leases for the three and six months ended June 30, 2020 and 2019 was as follows: Three Months Ended Six Months Ended 2020 2019 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 16,481 $ 14,105 $ 33,372 $ 28,801 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 11,676 $ 40,722 $ 42,928 $ 53,547 Non-cash net (decrease)/increase due to lease modifications: Operating lease right-of-use assets $ (8,566) $ 8,324 $ (3,982) $ 3,150 Operating lease liabilities $ (8,562) $ 8,358 $ (3,989) $ 3,252
Weighted Average Lease Terms and Discount Rates	Weighted average remaining lease term and discount rate as of June 30, 2020 and 2019 were as follows: As of June 30, 2020 As of June 30, 2019 Weighted average remaining lease term, in years: Operating leases 6.0 6.2 Weighted average discount rate: Operating leases 3.2 % 3.6 %
Maturity of Operating Lease Liabilities	As of June 30, 2020, operating lease liabilities will mature as follows: Year ending December 31, Lease Payments 2020 (excluding six months ended June 30, 2020) $ 34,183 2021 59,786 2022 44,318 2023 32,080 2024 27,677 Thereafter 67,913 Total lease payments 265,957 Less: imputed interest (23,315) Total $ 242,642

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Outstanding Debt And Borrowing Capacity	The following table presents the outstanding debt and borrowing capacity of the Company under the 2017 Credit Facility: As of As of Outstanding debt $ 25,000 $ 25,000 Interest rate 1.2 % 2.8 % Irrevocable standby letters of credit $ — $ 303 Available borrowing capacity $ 275,000 $ 274,697 Current maximum borrowing capacity $ 300,000 $ 300,000

REVENUES (Tables)

REVENUES (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenues	The following tables present the disaggregation of the Company’s revenues by customer location, including a reconciliation of the disaggregated revenues with the reportable segments (Note 13 “Segment Information”) for the periods indicated: Three Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Customer Locations North America $ 370,693 $ 10,835 $ 408 $ 381,936 Europe 11,195 199,866 3 211,064 CIS 2,236 4 19,838 22,078 APAC 705 16,600 — 17,305 Revenues $ 384,829 $ 227,305 $ 20,249 $ 632,383 Six Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Customer Locations North America $ 748,477 $ 21,254 $ 2,035 $ 771,766 Europe 21,527 412,588 6 434,121 CIS 4,790 16 42,132 46,938 APAC 1,137 29,780 — 30,917 Revenues $ 775,931 $ 463,638 $ 44,173 $ 1,283,742 Three Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Customer Locations North America $ 323,221 $ 11,551 $ 16 $ 334,788 Europe 5,219 172,027 99 177,345 CIS 2,005 — 23,086 25,091 APAC 580 13,783 — 14,363 Revenues $ 331,025 $ 197,361 $ 23,201 $ 551,587 Six Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Customer Locations North America $ 626,966 $ 24,442 $ 32 $ 651,440 Europe 9,966 340,647 240 350,853 CIS 3,744 13 39,508 43,265 APAC 1,038 26,324 — 27,362 Revenues $ 641,714 $ 391,426 $ 39,780 $ 1,072,920 The following tables present the disaggregation of the Company’s revenues by industry vertical, including a reconciliation of the disaggregated revenues with the reportable segments (Note 13 “Segment Information”) for the periods indicated: Three Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Industry Verticals Business Information & Media $ 81,481 $ 58,338 $ 439 $ 140,258 Financial Services 47,687 66,655 13,633 127,975 Software & Hi-Tech 100,801 18,165 519 119,485 Travel & Consumer 52,193 51,253 3,824 107,270 Life Sciences & Healthcare 61,776 7,069 39 68,884 Emerging Verticals 40,891 25,825 1,795 68,511 Revenues $ 384,829 $ 227,305 $ 20,249 $ 632,383 Six Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Industry Verticals Business Information & Media $ 161,701 $ 116,484 $ 799 $ 278,984 Financial Services 95,555 134,249 29,814 259,618 Software & Hi-Tech 202,538 36,311 2,485 241,334 Travel & Consumer 106,917 112,320 7,563 226,800 Life Sciences & Healthcare 123,387 14,688 48 138,123 Emerging Verticals 85,833 49,586 3,464 138,883 Revenues $ 775,931 $ 463,638 $ 44,173 $ 1,283,742 Three Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Industry Verticals Business Information & Media $ 62,340 $ 35,691 $ 104 $ 98,135 Financial Services 43,517 58,879 18,009 120,405 Software & Hi-Tech 85,600 19,440 478 105,518 Travel & Consumer 48,178 56,175 2,761 107,114 Life Sciences & Healthcare 54,287 4,907 4 59,198 Emerging Verticals 37,103 22,269 1,845 61,217 Revenues $ 331,025 $ 197,361 $ 23,201 $ 551,587 Six Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Industry Verticals Business Information & Media $ 124,701 $ 68,222 $ 244 $ 193,167 Financial Services 81,911 120,714 31,041 233,666 Software & Hi-Tech 164,721 39,810 918 205,449 Travel & Consumer 95,178 111,377 4,885 211,440 Life Sciences & Healthcare 104,443 9,463 66 113,972 Emerging Verticals 70,760 41,840 2,626 115,226 Revenues $ 641,714 $ 391,426 $ 39,780 $ 1,072,920 The following tables present the disaggregation of the Company’s revenues by contract type including a reconciliation of the disaggregated revenues with the Company’s reportable segments (Note 13 “Segment Information”) for the periods indicated: Three Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Contract Types Time-and-material $ 348,715 $ 192,173 $ 13,972 $ 554,860 Fixed-price 33,855 32,253 6,259 72,367 Licensing 1,958 545 9 2,512 Other revenues 301 2,334 9 2,644 Revenues $ 384,829 $ 227,305 $ 20,249 $ 632,383 Six Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Contract Types Time-and-material $ 705,978 $ 382,493 $ 27,568 $ 1,116,039 Fixed-price 65,710 77,508 15,080 158,298 Licensing 3,728 707 1,467 5,902 Other revenues 515 2,930 58 3,503 Revenues $ 775,931 $ 463,638 $ 44,173 $ 1,283,742 Three Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Contract Types Time-and-material $ 300,326 $ 167,581 $ 12,047 $ 479,954 Fixed-price 29,681 29,204 10,943 69,828 Licensing 624 142 196 962 Other revenues 394 434 15 843 Revenues $ 331,025 $ 197,361 $ 23,201 $ 551,587 Six Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Contract Types Time-and-material $ 585,051 $ 335,794 $ 23,319 $ 944,164 Fixed-price 54,421 54,450 16,230 125,101 Licensing 1,460 540 202 2,202 Other revenues 782 642 29 1,453 Revenues $ 641,714 $ 391,426 $ 39,780 $ 1,072,920 Timing of Revenue Recognition The following tables present the timing of revenue recognition for the periods indicated: Three Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Timing of Revenue Recognition Transferred over time $ 383,573 $ 227,073 $ 20,240 $ 630,886 Transferred at a point of time 1,256 232 9 1,497 Revenues $ 384,829 $ 227,305 $ 20,249 $ 632,383 Six Months Ended June 30, 2020 Reportable Segments North America Europe Russia Consolidated Revenues Timing of Revenue Recognition Transferred over time $ 773,383 $ 463,244 $ 42,708 $ 1,279,335 Transferred at a point of time 2,548 394 1,465 4,407 Revenues $ 775,931 $ 463,638 $ 44,173 $ 1,283,742 Three Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Timing of Revenue Recognition Transferred over time $ 330,819 $ 197,255 $ 23,201 $ 551,275 Transferred at a point of time 206 106 — 312 Revenues $ 331,025 $ 197,361 $ 23,201 $ 551,587 Six Months Ended June 30, 2019 Reportable Segments North America Europe Russia Consolidated Revenues Timing of Revenue Recognition Transferred over time $ 641,104 $ 391,273 $ 39,780 $ 1,072,157 Transferred at a point of time 610 153 — 763 Revenues $ 641,714 $ 391,426 $ 39,780 $ 1,072,920
Revenue Expected to be Recognized in Future Related to Remaining Performance Obligations	The following table includes the estimated revenues expected to be recognized in the future related to performance obligations that are partially or fully unsatisfied as of June 30, 2020. The Company applies a practical expedient and does not disclose the value of unsatisfied performance obligations for contracts that (i) have an original expected duration of one year or less and (ii) contracts for which it recognizes revenues at the amount to which it has the right to invoice for services provided: Less than 1 year 1 Year 2 Years 3 Years Total Contract Type Fixed-price $ 15,395 $ 546 $ — $ — $ 15,941
Contract Balances	The following table provides information on the classification of contract assets and liabilities in the condensed consolidated balance sheets: As of As of Contract assets included in Trade receivables and contract assets $ 12,353 $ 14,320 Contract liabilities included in Accrued expenses and other current liabilities $ 11,461 $ 9,132

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	6 Months Ended
	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Components of Stock-Based Compensation Expenses	The following table summarizes the components of stock-based compensation expense recognized in the Company’s condensed consolidated statements of income and comprehensive income for the periods indicated: Three Months Ended Six Months Ended 2020 2019 2020 2019 Cost of revenues (exclusive of depreciation and amortization) $ 8,958 $ 7,480 $ 12,942 $ 20,261 Selling, general and administrative expenses 10,481 8,217 18,378 17,292 Total $ 19,439 $ 15,697 $ 31,320 $ 37,553
Stock Options Activity	Stock option activity under the Company’s plans is set forth below: Number of Weighted Average Aggregate Weighted Average Options outstanding at January 1, 2020 3,322,930 $ 50.85 Options granted 147,351 $ 176.21 Options exercised (441,199) $ 39.12 Options forfeited/cancelled (9,137) $ 117.40 Options outstanding at June 30, 2020 3,019,945 $ 58.48 $ 584,445 4.7 Options vested and exercisable at June 30, 2020 2,641,633 $ 45.82 $ 544,682 4.1 Options expected to vest at June 30, 2020 348,999 $ 145.93 $ 37,021 8.6
Service-Based Awards Activity	The table below summarizes activity related to the Company’s equity-classified and liability-classified service-based awards for the six months ended June 30, 2020: Equity-Classified Restricted Stock Equity-Classified Equity-Settled Restricted Stock Units Liability-Classified Cash-Settled Restricted Stock Units Number of Shares Weighted Average Grant Date Number of Shares Weighted Average Grant Date Number of Shares Weighted Average Grant Date Unvested service-based awards outstanding at January 1, 2020 9,791 $ 162.96 758,785 $ 122.48 242,288 $ 105.40 Awards granted — $ — 251,864 $ 180.18 59,770 $ 180.37 Awards vested — $ — (294,872) $ 106.73 (118,777) $ 89.34 Awards forfeited/cancelled — $ — (28,126) $ 137.76 (3,456) $ 108.89 Unvested service-based awards outstanding at June 30, 2020 9,791 $ 162.96 687,651 $ 149.74 179,825 $ 140.86
Performance-Based Awards Activity	The table below summarizes activity related to the Company’s equity-classified performance-based awards for the six months ended June 30, 2020: Equity-Classified Equity-Settled Restricted Stock Equity-Classified Equity-Settled Restricted Stock Units Number of Shares Weighted Average Grant Date Number of Shares Weighted Average Grant Date Unvested performance-based awards outstanding at January 1, 2020 9,393 $ 165.87 — $ — Awards granted — $ — 24,836 $ 177.81 Unvested performance-based awards outstanding at June 30, 2020 9,393 $ 165.87 24,836 $ 177.81

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share of common stock as follows: Three Months Ended Six Months Ended 2020 2019 2020 2019 Numerator for basic and diluted earnings per share: Net income $ 66,624 $ 58,777 $ 152,189 $ 119,531 Numerator for basic and diluted earnings per share $ 66,624 $ 58,777 $ 152,189 $ 119,531 Denominator: Weighted average common shares for basic earnings per share 55,700,706 54,681,959 55,493,727 54,464,753 Net effect of dilutive stock options, restricted stock units and restricted stock awards 2,545,525 2,932,325 2,700,674 2,961,810 Weighted average common shares for diluted earnings per share 58,246,231 57,614,284 58,194,401 57,426,563 Net income per share: Basic $ 1.20 $ 1.07 $ 2.74 $ 2.19 Diluted $ 1.14 $ 1.02 $ 2.62 $ 2.08

SEGMENTS INFORMATION (Tables)

SEGMENTS INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Revenues from External Customers and Operating Profit, Before Unallocated Expenses	Revenues from external customers and operating profit/(loss), before unallocated expenses, by reportable segment for the three and six months ended June 30, 2020 and 2019, were as follows: Three Months Ended Six Months Ended 2020 2019 2020 2019 Segment revenues: North America $ 384,829 $ 331,025 $ 775,931 $ 641,714 Europe 227,305 197,361 463,638 391,426 Russia 20,249 23,201 44,173 39,780 Total segment revenues $ 632,383 $ 551,587 $ 1,283,742 $ 1,072,920 Segment operating profit/(loss): North America $ 82,752 $ 69,347 $ 161,679 $ 133,804 Europe 34,426 27,679 66,205 59,464 Russia (5,645) 5,652 (5,126) 6,241 Total segment operating profit $ 111,533 $ 102,678 $ 222,758 $ 199,509
Reconciliation of Segment Operating Profit to Consolidated Income Before Provision for Income Taxes	Reconciliation of segment operating profit to consolidated income before provision for income taxes is presented below: Three Months Ended Six Months Ended 2020 2019 2020 2019 Total segment operating profit: $ 111,533 $ 102,678 $ 222,758 $ 199,509 Unallocated amounts: Stock-based compensation expense (19,439) (15,697) (31,320) (37,553) Amortization of intangibles assets (2,994) (2,601) (6,129) (4,739) Other acquisition-related expenses (148) (850) (616) (1,361) Other unallocated expenses (5,526) (10,648) (13,758) (18,316) Income from operations 83,426 72,882 170,935 137,540 Interest and other income, net 1,817 1,190 4,203 4,266 Foreign exchange loss (9,167) (3,562) (2,643) (7,046) Income before provision for income taxes $ 76,076 $ 70,510 $ 172,495 $ 134,760
Physical Location and Values of Long-Lived Assets	Physical locations and values of the Company’s long-lived assets are presented below: As of As of Belarus $ 73,989 $ 75,984 Ukraine 29,577 24,652 United States 17,697 15,637 Russia 15,249 17,980 India 6,553 7,443 Poland 4,803 5,029 Hungary 4,684 5,201 China 2,621 3,036 Mexico 2,591 2,353 Other 9,595 7,944 Total $ 167,359 $ 165,259
Revenues by Customer Location	The table below presents information about the Company’s revenues by customer location for the three and six months ended June 30, 2020 and 2019: Three Months Ended Six Months Ended 2020 2019 2020 2019 United States $ 365,004 $ 318,988 $ 735,093 $ 618,668 United Kingdom 82,277 69,042 174,409 134,781 Switzerland 46,537 35,364 93,759 71,597 Netherlands 27,237 21,039 53,146 41,655 Russia 19,448 22,460 41,409 38,352 Germany 19,798 19,622 39,991 38,776 Canada 16,585 15,785 34,505 32,757 Other locations 55,497 49,287 111,430 96,334 Total $ 632,383 $ 551,587 $ 1,283,742 $ 1,072,920

ACQUISITION (Narrative) (Detail

ACQUISITION (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)
Business Acquisition [Line Items]
Number of acquisitions			1
Revenues	$ 632,383	$ 551,587	$ 1,283,742	$ 1,072,920
2020 Acquisition
Business Acquisition [Line Items]
Purchase price including contingent consideration	14,663		14,663
Contingent consideration fair value	4,042		4,042
Maximum amount of earnout payable	16,582		16,582
Intangible assets	6,300		6,300
Revenues	$ 1,190		$ 2,233

ACQUISITION (Fair Value of the

ACQUISITION (Fair Value of the Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Apr. 30, 2019
Business Acquisition [Line Items]
Goodwill	$ 199,039	$ 195,043
test IO
Business Acquisition [Line Items]
Cash and cash equivalents			$ 663
Trade receivables and contract assets			621
Prepaid and other current assets			150
Goodwill			11,926
Intangible assets			6,219
Property and equipment and other noncurrent assets			305
Total assets acquired			19,884
Accounts payable, accrued expenses and other current liabilities			993
Other noncurrent liabilities			1,568
Total liabilities assumed			2,561
Net assets acquired			$ 17,323
Goodwill, Purchase Accounting Adjustments	$ 226

GOODWILL (Goodwill Roll Forward

GOODWILL (Goodwill Roll Forward) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Goodwill [Roll Forward]
Balance as of January 1, 2020	$ 195,043
Effect of net foreign currency exchange rate changes	(2,670)
Balance as of June 30, 2020	199,039
test IO
Goodwill [Roll Forward]
Purchase accounting adjustments	(226)
Other 2019 Acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments	599
2020 Acquisition
Goodwill [Roll Forward]
Acquisition	6,293
North America
Goodwill [Roll Forward]
Balance as of January 1, 2020	113,426
Effect of net foreign currency exchange rate changes	(177)
Balance as of June 30, 2020	120,778
North America | test IO
Goodwill [Roll Forward]
Purchase accounting adjustments	863
North America | Other 2019 Acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments	373
North America | 2020 Acquisition
Goodwill [Roll Forward]
Acquisition	6,293
Europe
Goodwill [Roll Forward]
Balance as of January 1, 2020	80,873
Effect of net foreign currency exchange rate changes	(2,460)
Balance as of June 30, 2020	77,515
Europe | test IO
Goodwill [Roll Forward]
Purchase accounting adjustments	(1,089)
Europe | Other 2019 Acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments	191
Europe | 2020 Acquisition
Goodwill [Roll Forward]
Acquisition	0
Russia
Goodwill [Roll Forward]
Balance as of January 1, 2020	744
Effect of net foreign currency exchange rate changes	(33)
Balance as of June 30, 2020	746
Russia | test IO
Goodwill [Roll Forward]
Purchase accounting adjustments	0
Russia | Other 2019 Acquisitions
Goodwill [Roll Forward]
Purchase accounting adjustments	35
Russia | 2020 Acquisition
Goodwill [Roll Forward]
Acquisition	$ 0

GOODWILL (Goodwill Accumulated

GOODWILL (Goodwill Accumulated Impairment Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
North America
Goodwill [Line Items]
Accumulated impairment loss	$ 0	$ 0
Europe
Goodwill [Line Items]
Accumulated impairment loss	0	0
Russia
Goodwill [Line Items]
Accumulated impairment loss	$ 2,241	$ 2,241

FAIR VALUE MEASUREMENTS (Financ

FAIR VALUE MEASUREMENTS (Financial Assets and Liabilities at Fair Value on Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial Assets:
Total assets measured at fair value on a recurring basis	$ 932	$ 1,910
Financial Liabilities:
Contingent consideration	4,705	10,495
Total liabilities measured at fair value on a recurring basis	7,740	10,738
Foreign exchange contracts
Financial Assets:
Derivative assets	932	1,910
Financial Liabilities:
Derivative liabilities	3,035	243
Level 1
Financial Assets:
Total assets measured at fair value on a recurring basis	0	0
Financial Liabilities:
Contingent consideration	0	0
Total liabilities measured at fair value on a recurring basis	0	0
Level 1 | Foreign exchange contracts
Financial Assets:
Derivative assets	0	0
Financial Liabilities:
Derivative liabilities	0	0
Level 2
Financial Assets:
Total assets measured at fair value on a recurring basis	932	1,910
Financial Liabilities:
Contingent consideration	0	0
Total liabilities measured at fair value on a recurring basis	3,035	243
Level 2 | Foreign exchange contracts
Financial Assets:
Derivative assets	932	1,910
Financial Liabilities:
Derivative liabilities	3,035	243
Level 3
Financial Assets:
Total assets measured at fair value on a recurring basis	0	0
Financial Liabilities:
Contingent consideration	4,705	10,495
Total liabilities measured at fair value on a recurring basis	4,705	10,495
Level 3 | Foreign exchange contracts
Financial Assets:
Derivative assets	0	0
Financial Liabilities:
Derivative liabilities	$ 0	$ 0

FAIR VALUE MEASUREMENTS (Acquis

FAIR VALUE MEASUREMENTS (Acquisition-Related Contingent Consideration Roll Forward) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Discount rate | 2020 Acquisition
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Business Combination, Contingent Consideration, Liability, Measurement Input	0.175
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Contingent consideration liabilities as of January 1, 2020	$ 10,495
Payment of contingent consideration for previously acquired business	(7,869)
Effect of net foreign currency exchange rate changes	(525)
Contingent consideration liabilities as of June 30, 2020	4,705
Level 3 | Interest and other income, net
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Changes in the fair value of contingent consideration	(1,438)
Level 3 | 2020 Acquisition
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition date fair value of contingent consideration	$ 4,042

FAIR VALUE MEASUREMENTS (Estima

FAIR VALUE MEASUREMENTS (Estimated Fair Values of the Financial Assets and Liabilities not Measured at Fair Value on a Recurring Basis) (Details) - Nonrecurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Level 1
Financial Assets:
Cash equivalents:		$ 407,817
Restricted cash		1,136
Employee loans		0
Level 1 | Revolving credit facility | Credit Facility 2017
Financial Liabilities:
Borrowings		0
Level 2
Financial Assets:
Cash equivalents:		10,002
Restricted cash		0
Employee loans		0
Level 2 | Revolving credit facility | Credit Facility 2017
Financial Liabilities:
Borrowings		25,017
Level 3
Financial Assets:
Cash equivalents:		0
Restricted cash		0
Employee loans		2,434
Level 3 | Revolving credit facility | Credit Facility 2017
Financial Liabilities:
Borrowings		0
Balance
Financial Assets:
Cash equivalents:	$ 189,873	417,819
Restricted cash	1,157	1,136
Employee loans	1,491	2,434
Balance | Revolving credit facility | Credit Facility 2017
Financial Liabilities:
Borrowings	25,007	25,017
Estimated Fair Value
Financial Assets:
Cash equivalents:	189,873	417,819
Restricted cash	1,157	1,136
Employee loans	1,491	2,434
Estimated Fair Value | Revolving credit facility | Credit Facility 2017
Financial Liabilities:
Borrowings	25,007	25,017
Estimated Fair Value | Level 1
Financial Assets:
Cash equivalents:	189,873
Restricted cash	1,157	1,136
Employee loans	0	0
Estimated Fair Value | Level 1 | Revolving credit facility | Credit Facility 2017
Financial Liabilities:
Borrowings	0	0
Estimated Fair Value | Level 2
Financial Assets:
Cash equivalents:	0
Restricted cash	0	0
Employee loans	0	0
Estimated Fair Value | Level 2 | Revolving credit facility | Credit Facility 2017
Financial Liabilities:
Borrowings	25,007	25,017
Estimated Fair Value | Level 3
Financial Assets:
Cash equivalents:	0
Restricted cash	0	0
Employee loans	1,491	2,434
Estimated Fair Value | Level 3 | Revolving credit facility | Credit Facility 2017
Financial Liabilities:
Borrowings	0	0
Money market funds | Level 1
Financial Assets:
Cash equivalents:		407,817
Money market funds | Level 2
Financial Assets:
Cash equivalents:		0
Money market funds | Level 3
Financial Assets:
Cash equivalents:		0
Money market funds | Balance
Financial Assets:
Cash equivalents:	189,873	407,817
Money market funds | Estimated Fair Value
Financial Assets:
Cash equivalents:	189,873	407,817
Money market funds | Estimated Fair Value | Level 1
Financial Assets:
Cash equivalents:	189,873	407,817
Money market funds | Estimated Fair Value | Level 2
Financial Assets:
Cash equivalents:	0	0
Money market funds | Estimated Fair Value | Level 3
Financial Assets:
Cash equivalents:	0	0
Time deposits | Level 1
Financial Assets:
Cash equivalents:		0
Time deposits | Level 2
Financial Assets:
Cash equivalents:		10,002
Time deposits | Level 3
Financial Assets:
Cash equivalents:		0
Time deposits | Balance
Financial Assets:
Cash equivalents:		10,002
Short-term investments	60,025
Time deposits | Estimated Fair Value
Financial Assets:
Cash equivalents:		10,002
Short-term investments	60,025
Time deposits | Estimated Fair Value | Level 1
Financial Assets:
Cash equivalents:		0
Short-term investments	0
Time deposits | Estimated Fair Value | Level 2
Financial Assets:
Cash equivalents:		10,002
Short-term investments	60,025
Time deposits | Estimated Fair Value | Level 3
Financial Assets:
Cash equivalents:		$ 0
Short-term investments	$ 0

FAIR VALUE MEASUREMENTS (Equity

FAIR VALUE MEASUREMENTS (Equity Securities Without Readily Determinable Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other noncurrent assets
Equity Securities without Readily Determinable Fair Value [Line Items]
Carrying amount of equity securities that do not have readily determinable fair values	$ 25,000	$ 5,750

DERIVATIVE FINANCIAL INSTRUME_4

DERIVATIVE FINANCIAL INSTRUMENTS (Fair Value of Derivative Instruments) (Details) - Foreign exchange contracts - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Financial collateral (including cash collateral) required to be posted	$ 0
Designated as hedging instruments | Cash flow hedging | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	932	$ 1,910
Designated as hedging instruments | Cash flow hedging | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 3,035	$ 243

DERIVATIVE FINANCIAL INSTRUME_5

DERIVATIVE FINANCIAL INSTRUMENTS (Changes in the Fair Value of Derivative Instruments) (Details) - Foreign exchange contracts - Designated as hedging instruments - Cash flow hedging - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cost of revenues (exclusive of depreciation and amortization)
Derivative Instruments, Gain (Loss) [Line Items]
Net (loss)/gain reclassified	$ (1,851)	$ 342	$ (2,511)	$ (110)
Accumulated other comprehensive loss
Derivative Instruments, Gain (Loss) [Line Items]
Net gain/(loss) in fair value	$ 8,317	$ 1,984	$ (3,770)	$ 5,983

LEASES (Narrative) (Details)

LEASES (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Lessee, Lease, Description [Line Items]
Operating leases description	The Company leases office space, corporate apartments, office equipment, and vehicles
Terms and conditions of variable lease payments	Many of the Company’s leases contain variable payments including changes in base rent and charges for common area maintenance or other miscellaneous expenses
Existence of options to extend	true
Existence of options to terminate	true
Description of operating leases that have not yet commenced	The Company had committed to payments of $2,281 related to operating lease agreements that had not yet commenced as of June 30, 2020. These operating leases will commence on various dates during 2020 with lease terms ranging from 1.4 to 5.8 years
Description of finance leases that have not yet commenced	The Company did not have any material finance lease agreements that had not yet commenced.
Commitments related to operating lease agreements that have not yet commenced	$ 2,281
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 month 6 days
Lease term of lease agreements that have not yet commenced	1 year 5 months 1 day
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years 10 months 24 days
Lease term of lease agreements that have not yet commenced	5 years 9 months 18 days

LEASES (Components of Lease Exp

LEASES (Components of Lease Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease, Cost [Line Items]
Total lease cost	$ 19,699	$ 18,201	$ 41,737	$ 34,915
Selling, general and administrative expenses
Lease, Cost [Line Items]
Operating lease cost	18,851	15,196	37,714	28,915
Variable lease cost	579	1,999	3,214	4,096
Short-term lease cost	$ 269	$ 1,006	$ 809	$ 1,904

LEASES (Supplemental Cash Flow

LEASES (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases	$ 16,481	$ 14,105	$ 33,372	$ 28,801
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	11,676	40,722	42,928	53,547
Non-cash net (decrease)/increase due to lease modifications:
Operating lease right-of-use assets	(8,566)	8,324	(3,982)	3,150
Operating lease liabilities	$ (8,562)	$ 8,358	$ (3,989)	$ 3,252

LEASES (Weighted Average Lease

LEASES (Weighted Average Lease Terms and Discount Rates) (Details)	Jun. 30, 2020	Dec. 31, 2019
Weighted average remaining lease term, in years:
Operating leases	6 years	6 years 2 months 12 days
Weighted average discount rate:
Operating leases	3.20%	3.60%

LEASES (Maturity of Operating L

LEASES (Maturity of Operating Lease Liabilities) (Details) $ in Thousands	Jun. 30, 2020USD ($)
Leases [Abstract]
2020 (excluding six months ended June 30, 2020)	$ 34,183
2021	59,786
2022	44,318
2023	32,080
2024	27,677
Thereafter	67,913
Total lease payments	265,957
Less: imputed interest	(23,315)
Total	$ 242,642

LONG-TERM DEBT (Details)

LONG-TERM DEBT (Details) - Credit Facility 2017 - USD ($) $ in Thousands	May 24, 2017	Jun. 30, 2020	Dec. 31, 2019
Revolving credit facility
Debt Instrument [Line Items]
Maturity date	May 24, 2022
Revolving credit facility | Overnight Bank Funding Rate
Debt Instrument [Line Items]
Variable interest rate spread	0.50%
Revolving credit facility | Daily LIBOR Rate
Debt Instrument [Line Items]
Variable interest rate spread	1.00%
Revolving 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		1.20%	2.80%
Available borrowing capacity		$ 275,000	$ 274,697
Revolving credit facility | U.S. dollars | Maximum
Debt Instrument [Line Items]
Line of credit, current borrowing capacity		300,000	300,000
Revolving credit facility | Other currencies, excluding U.S. dollars
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity	$ 100,000
Standby letters of credit
Debt Instrument [Line Items]
Irrevocable standby letters of credit		$ 0	$ 303

REVENUES (Disaggregation of Rev

REVENUES (Disaggregation of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 632,383	$ 551,587	$ 1,283,742	$ 1,072,920
Transferred over time
Disaggregation of Revenue [Line Items]
Revenues	630,886	551,275	1,279,335	1,072,157
Transferred at a point of time
Disaggregation of Revenue [Line Items]
Revenues	1,497	312	4,407	763
Time-and-material
Disaggregation of Revenue [Line Items]
Revenues	554,860	479,954	1,116,039	944,164
Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	72,367	69,828	158,298	125,101
Licensing
Disaggregation of Revenue [Line Items]
Revenues	2,512	962	5,902	2,202
Other revenues
Disaggregation of Revenue [Line Items]
Revenues	2,644	843	3,503	1,453
Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	140,258	98,135	278,984	193,167
Financial Services
Disaggregation of Revenue [Line Items]
Revenues	127,975	120,405	259,618	233,666
Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	119,485	105,518	241,334	205,449
Travel & Consumer
Disaggregation of Revenue [Line Items]
Revenues	107,270	107,114	226,800	211,440
Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	68,884	59,198	138,123	113,972
Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	68,511	61,217	138,883	115,226
North America
Disaggregation of Revenue [Line Items]
Revenues	381,936	334,788	771,766	651,440
Europe
Disaggregation of Revenue [Line Items]
Revenues	211,064	177,345	434,121	350,853
CIS
Disaggregation of Revenue [Line Items]
Revenues	22,078	25,091	46,938	43,265
APAC
Disaggregation of Revenue [Line Items]
Revenues	17,305	14,363	30,917	27,362
North America
Disaggregation of Revenue [Line Items]
Revenues	384,829	331,025	775,931	641,714
North America | Transferred over time
Disaggregation of Revenue [Line Items]
Revenues	383,573	330,819	773,383	641,104
North America | Transferred at a point of time
Disaggregation of Revenue [Line Items]
Revenues	1,256	206	2,548	610
North America | Time-and-material
Disaggregation of Revenue [Line Items]
Revenues	348,715	300,326	705,978	585,051
North America | Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	33,855	29,681	65,710	54,421
North America | Licensing
Disaggregation of Revenue [Line Items]
Revenues	1,958	624	3,728	1,460
North America | Other revenues
Disaggregation of Revenue [Line Items]
Revenues	301	394	515	782
North America | Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	81,481	62,340	161,701	124,701
North America | Financial Services
Disaggregation of Revenue [Line Items]
Revenues	47,687	43,517	95,555	81,911
North America | Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	100,801	85,600	202,538	164,721
North America | Travel & Consumer
Disaggregation of Revenue [Line Items]
Revenues	52,193	48,178	106,917	95,178
North America | Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	61,776	54,287	123,387	104,443
North America | Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	40,891	37,103	85,833	70,760
North America | North America
Disaggregation of Revenue [Line Items]
Revenues	370,693	323,221	748,477	626,966
North America | Europe
Disaggregation of Revenue [Line Items]
Revenues	11,195	5,219	21,527	9,966
North America | CIS
Disaggregation of Revenue [Line Items]
Revenues	2,236	2,005	4,790	3,744
North America | APAC
Disaggregation of Revenue [Line Items]
Revenues	705	580	1,137	1,038
Europe
Disaggregation of Revenue [Line Items]
Revenues	227,305	197,361	463,638	391,426
Europe | Transferred over time
Disaggregation of Revenue [Line Items]
Revenues	227,073	197,255	463,244	391,273
Europe | Transferred at a point of time
Disaggregation of Revenue [Line Items]
Revenues	232	106	394	153
Europe | Time-and-material
Disaggregation of Revenue [Line Items]
Revenues	192,173	167,581	382,493	335,794
Europe | Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	32,253	29,204	77,508	54,450
Europe | Licensing
Disaggregation of Revenue [Line Items]
Revenues	545	142	707	540
Europe | Other revenues
Disaggregation of Revenue [Line Items]
Revenues	2,334	434	2,930	642
Europe | Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	58,338	35,691	116,484	68,222
Europe | Financial Services
Disaggregation of Revenue [Line Items]
Revenues	66,655	58,879	134,249	120,714
Europe | Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	18,165	19,440	36,311	39,810
Europe | Travel & Consumer
Disaggregation of Revenue [Line Items]
Revenues	51,253	56,175	112,320	111,377
Europe | Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	7,069	4,907	14,688	9,463
Europe | Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	25,825	22,269	49,586	41,840
Europe | North America
Disaggregation of Revenue [Line Items]
Revenues	10,835	11,551	21,254	24,442
Europe | Europe
Disaggregation of Revenue [Line Items]
Revenues	199,866	172,027	412,588	340,647
Europe | CIS
Disaggregation of Revenue [Line Items]
Revenues	4	0	16	13
Europe | APAC
Disaggregation of Revenue [Line Items]
Revenues	16,600	13,783	29,780	26,324
Russia
Disaggregation of Revenue [Line Items]
Revenues	20,249	23,201	44,173	39,780
Russia | Transferred over time
Disaggregation of Revenue [Line Items]
Revenues	20,240	23,201	42,708	39,780
Russia | Transferred at a point of time
Disaggregation of Revenue [Line Items]
Revenues	9	0	1,465	0
Russia | Time-and-material
Disaggregation of Revenue [Line Items]
Revenues	13,972	12,047	27,568	23,319
Russia | Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	6,259	10,943	15,080	16,230
Russia | Licensing
Disaggregation of Revenue [Line Items]
Revenues	9	196	1,467	202
Russia | Other revenues
Disaggregation of Revenue [Line Items]
Revenues	9	15	58	29
Russia | Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	439	104	799	244
Russia | Financial Services
Disaggregation of Revenue [Line Items]
Revenues	13,633	18,009	29,814	31,041
Russia | Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	519	478	2,485	918
Russia | Travel & Consumer
Disaggregation of Revenue [Line Items]
Revenues	3,824	2,761	7,563	4,885
Russia | Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	39	4	48	66
Russia | Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	1,795	1,845	3,464	2,626
Russia | North America
Disaggregation of Revenue [Line Items]
Revenues	408	16	2,035	32
Russia | Europe
Disaggregation of Revenue [Line Items]
Revenues	3	99	6	240
Russia | CIS
Disaggregation of Revenue [Line Items]
Revenues	19,838	23,086	42,132	39,508
Russia | APAC
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0

REVENUES (Revenue Expected to b

REVENUES (Revenue Expected to be Recognized in Future Related to Remaining Performance Obligations) (Details) - Fixed-price $ in Thousands	Jun. 30, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated revenues expected to be recognized in the future	$ 15,941
Less than 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated revenues expected to be recognized in the future	15,395
1 Year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated revenues expected to be recognized in the future	546
2 Years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated revenues expected to be recognized in the future	0
3 Years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated revenues expected to be recognized in the future	$ 0

REVENUES (Contract Balances) (D

REVENUES (Contract Balances) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Change in Contract with Customer, Liability [Abstract]
Revenue recognized	$ 1,325	$ 610	$ 7,862	$ 3,661
Revenues from performance obligations satisfied in previous period	(3,669)	$ 7,693	4,182	$ 4,119
Trade receivables and contract assets
Change in Contract with Customer, Liability [Abstract]
Contract assets	12,353		12,353		$ 14,320
Accrued expenses and other current liabilities
Change in Contract with Customer, Liability [Abstract]
Contract liabilties	$ 11,461		$ 11,461		$ 9,132

STOCK-BASED COMPENSATION (Compo

STOCK-BASED COMPENSATION (Components of Stock-Based Compensation Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 19,439	$ 15,697	$ 31,320	$ 37,553
Cost of revenues (exclusive of depreciation and amortization)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	8,958	7,480	12,942	20,261
Selling, general and administrative expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 10,481	$ 8,217	$ 18,378	$ 17,292

STOCK-BASED COMPENSATION (Stock

STOCK-BASED COMPENSATION (Stock Options Activity) (Details) - Employee Stock Option - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020
Number of Options
Options outstanding at January 1, 2020	3,322,930
Options granted	147,351
Options exercised	(441,199)
Options forfeited/cancelled	(9,137)
Options outstanding at June 30, 2020	3,019,945
Options vested and exercisable at June 30, 2020	2,641,633
Options expected to vest at June 30, 2020	348,999
Weighted Average Exercise Price
Options outstanding at January 1, 2020	$ 50.85
Options granted	176.21
Options exercised	39.12
Options forfeited/cancelled	117.40
Options outstanding at June 30, 2020	58.48
Options vested and exercisable at June 30, 2020	45.82
Options expected to vest at June 30, 2020	$ 145.93
Aggregate Intrinsic Value
Options outstanding at June 30, 2020	$ 584,445
Options vested and exercisable at June 30, 2020	544,682
Options expected to vest at June 30, 2020	$ 37,021
Weighted Average Remaining Contractual Term (in years)
Options outstanding at June 30, 2020	4 years 8 months 12 days
Options vested and exercisable at June 30, 2020	4 years 1 month 6 days
Options expected to vest at June 30, 2020	8 years 7 months 6 days

STOCK-BASED COMPENSATION (Sto_2

STOCK-BASED COMPENSATION (Stock Option Additional Information) (Details) - Employee Stock Option $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized stock-based compensation cost	$ 17,196
Weighted-average remaining requisite service period	2 years 10 months 24 days

STOCK-BASED COMPENSATION (Restr

STOCK-BASED COMPENSATION (Restricted Stock and Restricted Stock Units Activity) (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock
Number of Shares
Unvested awards outstanding at January 1, 2020		9,791	9,791
Awards granted			0
Awards vested			0
Awards forfeited/cancelled			0
Unvested awards outstanding at June 30, 2020	9,791		9,791
Weighted Average Grant Date Fair Value Per Share
Unvested awards outstanding at January 1, 2020		$ 162.96	$ 162.96
Awards granted			0
Awards vested			0
Awards forfeited/cancelled			0
Unvested awards outstanding at June 30, 2020	$ 162.96		$ 162.96
Service Period | Equity Classified Award | Equity-Settled Award | Restricted stock units
Number of Shares
Unvested awards outstanding at January 1, 2020		758,785	758,785
Awards granted			251,864
Awards vested			(294,872)
Awards forfeited/cancelled			(28,126)
Unvested awards outstanding at June 30, 2020	687,651		687,651
Weighted Average Grant Date Fair Value Per Share
Unvested awards outstanding at January 1, 2020		$ 122.48	$ 122.48
Awards granted			180.18
Awards vested			106.73
Awards forfeited/cancelled			137.76
Unvested awards outstanding at June 30, 2020	$ 149.74		$ 149.74
Service Period | Liability Classified Award | Cash-Settled Award | Restricted stock units
Number of Shares
Unvested awards outstanding at January 1, 2020		242,288	242,288
Awards granted			59,770
Awards vested			(118,777)
Awards forfeited/cancelled			(3,456)
Unvested awards outstanding at June 30, 2020	179,825		179,825
Weighted Average Grant Date Fair Value Per Share
Unvested awards outstanding at January 1, 2020		$ 105.40	$ 105.40
Awards granted			180.37
Awards vested			89.34
Awards forfeited/cancelled			108.89
Unvested awards outstanding at June 30, 2020	$ 140.86		$ 140.86
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock
Number of Shares
Unvested awards outstanding at January 1, 2020		9,393	9,393
Awards granted			0
Unvested awards outstanding at June 30, 2020	9,393		9,393
Weighted Average Grant Date Fair Value Per Share
Unvested awards outstanding at January 1, 2020		$ 165.87	$ 165.87
Awards granted			0
Unvested awards outstanding at June 30, 2020	$ 165.87		$ 165.87
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted stock units
Number of Shares
Unvested awards outstanding at January 1, 2020		0	0
Awards granted			24,836
Unvested awards outstanding at June 30, 2020	24,836		24,836
Weighted Average Grant Date Fair Value Per Share
Unvested awards outstanding at January 1, 2020		$ 0	$ 0
Awards granted			177.81
Unvested awards outstanding at June 30, 2020	$ 177.81		$ 177.81
2020 Acquisition | Service Period | Equity Classified Award | Equity-Settled Award | Restricted stock units
Number of Shares
Awards granted			19,201
2020 Acquisition | Service Period | Liability Classified Award | Cash-Settled Award | Restricted stock units
Number of Shares
Awards granted			9,736
2019 Acquisitions | Service Period | Equity Classified Award | Equity-Settled Award | Restricted stock units
Number of Shares
Awards granted		5,793
2019 Acquisitions | Performance Target | Equity Classified Award | Equity-Settled Award | Restricted stock units
Number of Shares
Awards granted	24,836

STOCK-BASED COMPENSATION (Res_2

STOCK-BASED COMPENSATION (Restricted Stock and Restricted Stock Units Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized stock-based compensation cost		$ 1,138
Weighted-average remaining requisite service period		2 years 2 months 12 days
Service Period | Equity Classified Award | Equity-Settled Award | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized stock-based compensation cost		$ 83,125
Weighted-average remaining requisite service period		2 years 9 months 18 days
Service Period | Liability Classified Award | Cash-Settled Award | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized stock-based compensation cost		$ 32,302
Weighted-average remaining requisite service period		2 years 6 months
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized stock-based compensation cost		$ 1,236
Weighted-average remaining requisite service period		3 years 2 months 12 days
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized stock-based compensation cost		$ 2,569
Weighted-average remaining requisite service period		2 years 10 months 24 days
Accrued compensation and benefits expenses | Service Period | Liability Classified Award | Cash-Settled Award | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liability associated with RSUs		$ 9,122	$ 21,902
2020 Acquisition | Performance Target | Equity Classified Award | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award value	$ 2,171
Estimated future operating results, period	2 years
Awards vesting period	3 years

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Effective tax rate	12.40%	16.60%	11.80%	11.30%
Excess tax benefit	$ 8,129	$ 4,741	$ 19,826	$ 16,254

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator for basic and diluted earnings per share:
Net income	$ 66,624	$ 85,565	$ 58,777	$ 60,754	$ 152,189	$ 119,531
Numerator for basic and diluted earnings per share	$ 66,624		$ 58,777		$ 152,189	$ 119,531
Denominator:
Weighted average common shares for basic earnings per share	55,700,706		54,681,959		55,493,727	54,464,753
Net effect of dilutive stock options, restricted stock units and restricted stock awards	2,545,525		2,932,325		2,700,674	2,961,810
Weighted average common shares for diluted earnings per share	58,246,231		57,614,284		58,194,401	57,426,563
Net income per share:
Basic (in dollars per share)	$ 1.20		$ 1.07		$ 2.74	$ 2.19
Diluted (in dollars per share)	$ 1.14		$ 1.02		$ 2.62	$ 2.08
Anti-dilutive options not included in the calculation (in shares)	146,732		168,451		77,925	97,327

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Building Acquisition Commitments) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Office Space Purchase Commitment | Ukraine
Other Commitments [Line Items]
Total commitment amount	$ 36,900

SEGMENTS INFORMATION (Revenues

SEGMENTS INFORMATION (Revenues from External Customers and Operating Profit Before Unallocated Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 632,383	$ 551,587	$ 1,283,742	$ 1,072,920
Segment operating profit	83,426	72,882	170,935	137,540
North America
Segment Reporting Information [Line Items]
Revenues	384,829	331,025	775,931	641,714
Segment operating profit	82,752	69,347	161,679	133,804
Europe
Segment Reporting Information [Line Items]
Revenues	227,305	197,361	463,638	391,426
Segment operating profit	34,426	27,679	66,205	59,464
Russia
Segment Reporting Information [Line Items]
Revenues	20,249	23,201	44,173	39,780
Segment operating profit	(5,645)	5,652	(5,126)	6,241
Operating Segments
Segment Reporting Information [Line Items]
Segment operating profit	$ 111,533	$ 102,678	$ 222,758	$ 199,509

SEGMENTS INFORMATION (Major Cus

SEGMENTS INFORMATION (Major Customers) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue, Segment Benchmark [Member] | Customer Concentration Risk | Operating Segments
Revenue, Major Customer [Line Items]
Number of customers	0	0	0	0

SEGMENTS INFORMATION (Reconcili

SEGMENTS INFORMATION (Reconciliation of Segment Operating Profit to Consolidated Income Before Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment operating profit	$ 83,426	$ 72,882	$ 170,935	$ 137,540
Stock-based compensation expense			31,320	37,553
Interest and other income, net	1,817	1,190	4,203	4,266
Foreign exchange loss	(9,167)	(3,562)	(2,643)	(7,046)
Income before provision for income taxes	76,076	70,510	172,495	134,760
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment operating profit	111,533	102,678	222,758	199,509
Unallocated Amounts
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Stock-based compensation expense	(19,439)	(15,697)	(31,320)	(37,553)
Amortization of intangibles assets	(2,994)	(2,601)	(6,129)	(4,739)
Other acquisition-related expenses	(148)	(850)	(616)	(1,361)
Other unallocated expenses	$ (5,526)	$ (10,648)	$ (13,758)	$ (18,316)

SEGMENTS INFORMATION (Physical

SEGMENTS INFORMATION (Physical Location and Values of Long-Lived Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 167,359	$ 165,259
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	73,989	75,984
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	29,577	24,652
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	17,697	15,637
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	15,249	17,980
India
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	6,553	7,443
Poland
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	4,803	5,029
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	4,684	5,201
China
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,621	3,036
Mexico
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,591	2,353
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 9,595	$ 7,944

SEGMENTS INFORMATION (Revenue_2

SEGMENTS INFORMATION (Revenues by Customer Location) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 632,383	$ 551,587	$ 1,283,742	$ 1,072,920
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	365,004	318,988	735,093	618,668
United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	82,277	69,042	174,409	134,781
Switzerland
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	46,537	35,364	93,759	71,597
Netherlands
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	27,237	21,039	53,146	41,655
Russia
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	19,448	22,460	41,409	38,352
Germany
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	19,798	19,622	39,991	38,776
Canada
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	16,585	15,785	34,505	32,757
Other locations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 55,497	$ 49,287	$ 111,430	$ 96,334