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REVENUES (Disaggregation of Revenues) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 1,210,941 | $ 1,171,614
Revenues from performance obligations satisfied in previous period | 7,200 |
Increase (decrease) in contract with customer, liability |  | 6,000
Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,207,255 | 1,168,848
Transferred at a point of time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,686 | 2,766
Time-and-material |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,074,979 | 1,023,153
Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 130,505 | 143,563
Licensing and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,457 | 4,898
Travel & Consumer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 278,360 | 265,319
Financial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 270,665 | 260,063
Business Information & Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 202,380 | 194,303
Software & Hi-Tech |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 189,191 | 189,483
Life Sciences & Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 111,258 | 123,803
Emerging Verticals |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 159,087 | 138,643
Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 709,802 | 686,793
EMEA |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 463,937 | 421,950
APAC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 26,810 | 29,582
CEE |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 10,392 | 33,289
North America |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 709,957 | 687,711
North America | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 707,034 | 685,109
North America | Transferred at a point of time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,923 | 2,602
North America | Time-and-material |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 644,628 | 626,807
North America | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 61,231 | 56,765
North America | Licensing and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,098 | 4,139
North America | Travel & Consumer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 123,659 | 122,247
North America | Financial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 143,850 | 120,335
North America | Business Information & Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 116,158 | 110,946
North America | Software & Hi-Tech |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 149,798 | 156,282
North America | Life Sciences & Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 96,597 | 111,371
North America | Emerging Verticals |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 79,895 | 66,530
North America | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 683,553 | 659,776
North America | EMEA |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 25,372 | 25,098
North America | APAC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 726 | 783
North America | CEE |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 306 | 2,054
Europe |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 493,147 | 451,970
Europe | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 492,397 | 451,848
Europe | Transferred at a point of time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 750 | 122
Europe | Time-and-material |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 425,598 | 377,655
Europe | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 66,203 | 73,608
Europe | Licensing and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,346 | 707
Europe | Travel & Consumer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 153,055 | 136,788
Europe | Financial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 123,608 | 117,330
Europe | Business Information & Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 86,108 | 82,901
Europe | Software & Hi-Tech |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 38,682 | 32,454
Europe | Life Sciences & Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 14,526 | 12,282
Europe | Emerging Verticals |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 77,168 | 70,215
Europe | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 25,954 | 25,960
Europe | EMEA |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 438,565 | 396,753
Europe | APAC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 26,084 | 28,799
Europe | CEE |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,544 | 458
Russia |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,837 | 31,933
Russia | Transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,824 | 31,891
Russia | Transferred at a point of time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 13 | 42
Russia | Time-and-material |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,753 | 18,691
Russia | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,071 | 13,190
Russia | Licensing and other revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 13 | 52
Russia | Travel & Consumer |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,646 | 6,284
Russia | Financial Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,207 | 22,398
Russia | Business Information & Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 114 | 456
Russia | Software & Hi-Tech |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 711 | 747
Russia | Life Sciences & Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 135 | 150
Russia | Emerging Verticals |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,024 | 1,898
Russia | Americas |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 295 | 1,057
Russia | EMEA |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 99
Russia | APAC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Russia | CEE |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 7,542 | $ 30,777

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