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ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2015
--- | --- | --- | --- | ---
Receivables [Abstract] |  |  |  |
Accounts receivable | $ 188,952 | $ 245,236 |  |
Allowance for doubtful accounts | (3,714) | (3,404) | $ (2,974) | $ (3,344)
Accounts receivable, net | $ 185,238 | $ 241,832 |  |

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