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OTHER RECEIVABLES (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Claims receivable | $ 5,178 | $ 9,690 |  |
Agent receivables | 3,474 | 3,733 |  |
Other receivables | 16,816 | 3,645 |  |
Other receivables, total | 25,468 | 17,068 |  |
Allowance for doubtful accounts | 2,948 | 5,795 | $ 5,998 | $ 6,170
Other receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for doubtful accounts | $ 0 | $ 0 |  |

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