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CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Major Customers |  |  |
Revenues | $ 1,961,720 | $ 2,002,857 | $ 1,796,220
Trade receivables | $ 161,679 | $ 174,914 |
Revenue | Geographic Concentration Risk |  |  |
Major Customers |  |  |
Concentration of risk (as a percent) | 17.90% | 27.80% | 17.40%
Revenue | Customer Concentration Risk | Customer A |  |  |
Major Customers |  |  |
Revenues | $ 228,500 | $ 219,115 |
Revenue | Customer Concentration Risk | Customer B |  |  |
Major Customers |  |  |
Revenues | 213,319 |  |
Trade accounts receivable | Customer Concentration Risk | Major customers |  |  |
Major Customers |  |  |
Trade receivables | $ 26,300 |  |
Trade accounts receivable | Customer Concentration Risk | Customer A |  |  |
Major Customers |  |  |
Trade receivables |  | $ 12,800 |

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