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ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS(NARRATIVE) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2018
Entity Wide Revenue Major Customer Line Items |  |  |  |  |
Revenue. | $ 566,734 | $ 492,980 | $ 1,660,747 | $ 1,378,274 |
Sears |  |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |  |
Accounts receivable amount from major customer | $ 2,700 |  | 2,700 |  | $ 2,700
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 |  |
Concentration risk percentage |  |  | 13.30% | 11.80% |

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