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ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS(NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Entity Wide Revenue Major Customer Line Items |  |
Revenue. | $ 588,726 | $ 539,219
Revenue | Customer Concentration Risk | Minimum |  |
Entity Wide Revenue Major Customer Line Items |  |
Revenue. | $ 100,000 |
Revenue | Customer Concentration Risk | Financial Services Client |  |
Entity Wide Revenue Major Customer Line Items |  |
Concentration Risk, Customer | one | one
Concentration risk percentage | 7.30% | 15.70%
Revenue | Customer Concentration Risk | Automotive Industry Client |  |
Entity Wide Revenue Major Customer Line Items |  |
Concentration Risk, Customer | one | one
Concentration risk percentage | 10.40% | 8.80%

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