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ACCOUNTS RECEIVABLE (SIGNIFICANT CLIENTS TABLE) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Concentration Risk, Percentage of Revenue from Major Customer |  |  |
Accounts receivable, net | $ 357,310 | $ 378,397 |
Revenue | Customer Concentration Risk | Financial Services Client |  |  |
Concentration Risk, Percentage of Revenue from Major Customer |  |  |
Concentration risk percentage | 12.00% | 13.00% | 3.00%
Accounts Receivable | Credit Concentration Risk | Financial Services Client |  |  |
Concentration Risk, Percentage of Revenue from Major Customer |  |  |
Accounts receivable, net | $ 15,483 | $ 58,960 | $ 4,321

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