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REVENUES (Schedule of Disaggregation of Revenues) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) market	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Revenue from Contract with Customer [Abstract]
Number of geographic markets | market	3
Disaggregation of Revenue [Line Items]
Revenues	$ 5,457,056	$ 4,727,940	$ 4,690,540
Revenues from performance obligations satisfied in previous period	23,300	13,600	5,800
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenues	4,364,413	3,900,952	4,082,503
Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	1,063,210	797,231	579,230
Licensing and other revenues
Disaggregation of Revenue [Line Items]
Revenues	29,433	29,757	28,807
Financial Services
Disaggregation of Revenue [Line Items]
Revenues	1,316,487	1,022,617	1,018,433
Consumer Goods, Retail & Travel
Disaggregation of Revenue [Line Items]
Revenues	1,077,513	1,013,138	1,072,950
Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	821,819	702,367	707,720
Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	675,667	674,597	753,981
Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	625,607	574,605	489,914
Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	939,963	740,616	647,542
Americas
Disaggregation of Revenue [Line Items]
Revenues	3,166,116	2,866,339	2,765,022
Americas | Time-and-materials
Disaggregation of Revenue [Line Items]
Revenues	2,608,351	2,423,554	2,457,545
Americas | Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	534,046	419,361	283,183
Americas | Licensing and other revenues
Disaggregation of Revenue [Line Items]
Revenues	23,719	23,424	24,294
Americas | Financial Services
Disaggregation of Revenue [Line Items]
Revenues	603,711	519,986	538,837
Americas | Consumer Goods, Retail & Travel
Disaggregation of Revenue [Line Items]
Revenues	479,934	450,162	472,350
Americas | Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	560,449	525,091	552,492
Americas | Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	465,232	449,449	429,800
Americas | Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	496,831	488,455	429,245
Americas | Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	559,959	433,196	342,298
Europe
Disaggregation of Revenue [Line Items]
Revenues	2,290,940	1,861,601	1,909,443
Europe | Time-and-materials
Disaggregation of Revenue [Line Items]
Revenues	1,756,062	1,477,398	1,613,790
Europe | Fixed-price
Disaggregation of Revenue [Line Items]
Revenues	529,164	377,870	291,174
Europe | Licensing and other revenues
Disaggregation of Revenue [Line Items]
Revenues	5,714	6,333	4,479
Europe | Financial Services
Disaggregation of Revenue [Line Items]
Revenues	712,776	502,631	472,146
Europe | Consumer Goods, Retail & Travel
Disaggregation of Revenue [Line Items]
Revenues	597,579	562,976	596,830
Europe | Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues	261,370	177,276	153,683
Europe | Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues	210,435	225,148	323,985
Europe | Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues	128,776	86,150	60,549
Europe | Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues	380,004	307,420	302,250
Russia
Disaggregation of Revenue [Line Items]
Revenues			16,075
Russia | Time-and-materials
Disaggregation of Revenue [Line Items]
Revenues			11,168
Russia | Fixed-price
Disaggregation of Revenue [Line Items]
Revenues			4,873
Russia | Licensing and other revenues
Disaggregation of Revenue [Line Items]
Revenues			34
Russia | Financial Services
Disaggregation of Revenue [Line Items]
Revenues			7,450
Russia | Consumer Goods, Retail & Travel
Disaggregation of Revenue [Line Items]
Revenues			3,770
Russia | Software & Hi-Tech
Disaggregation of Revenue [Line Items]
Revenues			1,545
Russia | Business Information & Media
Disaggregation of Revenue [Line Items]
Revenues			196
Russia | Life Sciences & Healthcare
Disaggregation of Revenue [Line Items]
Revenues			120
Russia | Emerging Verticals
Disaggregation of Revenue [Line Items]
Revenues			2,994
Americas
Disaggregation of Revenue [Line Items]
Revenues	3,200,924	2,834,704	2,742,662
Americas | Americas
Disaggregation of Revenue [Line Items]
Revenues	3,011,650	2,726,757	2,645,174
Americas | Europe
Disaggregation of Revenue [Line Items]
Revenues	189,274	107,947	96,857
Americas | Russia
Disaggregation of Revenue [Line Items]
Revenues			631
EMEA
Disaggregation of Revenue [Line Items]
Revenues	2,147,304	1,793,198	1,822,782
EMEA | Americas
Disaggregation of Revenue [Line Items]
Revenues	152,558	137,370	116,054
EMEA | Europe
Disaggregation of Revenue [Line Items]
Revenues	1,994,746	1,655,828	1,706,728
EMEA | Russia
Disaggregation of Revenue [Line Items]
Revenues			0
APAC
Disaggregation of Revenue [Line Items]
Revenues	108,828	100,038	102,138
APAC | Americas
Disaggregation of Revenue [Line Items]
Revenues	1,908	2,212	3,248
APAC | Europe
Disaggregation of Revenue [Line Items]
Revenues	$ 106,920	$ 97,826	98,890
APAC | Russia
Disaggregation of Revenue [Line Items]
Revenues			0
CEE
Disaggregation of Revenue [Line Items]
Revenues			22,958
CEE | Americas
Disaggregation of Revenue [Line Items]
Revenues			546
CEE | Europe
Disaggregation of Revenue [Line Items]
Revenues			6,968
CEE | Russia
Disaggregation of Revenue [Line Items]
Revenues			$ 15,444

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