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RELATED PARTY TRANSACTIONS - Summary of Net Amounts Earned (Incurred) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Seatankers Management Co. Ltd |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | $ 18,878 | $ 7,152 | $ 3,420
SFL |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 1,591 | 2,001 | 3,473
Golden Ocean |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 6,851 | 7,138 | 6,671
Seatankers Management Norway AS |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | (705) | (735) | (767)
Arcadia Petroleum Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 3,197 | 0 | 0
Seadrill Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 367 | 279 | 470
Archer Limited |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 418 | 317 | 238
Flex LNG Ltd |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 1,195 | 1,788 | 4,432
North Atlantic Drilling Ltd |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 0 | 29 | 37
Avance Gas |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 518 | 0 | 0
Other related parties |  |  |
Related Party Transaction [Line Items] |  |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | $ 197 | $ 101 | $ 67

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