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OPERATING REVENUES - Contract Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Capitalized Contract Cost [Line Items] |  |
Contract assets | $ 82,192 | $ 62,958
Voyages in progress |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 26,601 | 27,621
Trade accounts receivable |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 42,745 | 25,615
Related party receivables |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 9,509 | 7,195
Other current assets |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | $ 3,337 | $ 2,527

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