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OPERATING REVENUES - Contract Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Capitalized Contract Cost [Line Items] |  |
Contract assets | $ 81,753 | $ 120,158
Voyages in progress |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 26,021 | 59,437
Trade accounts receivable |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 42,104 | 52,278
Related party receivables |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 9,137 | 3,084
Other current assets |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | $ 4,491 | $ 5,359

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