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RELATED PARTY TRANSACTIONS - Transactions with related parties (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Seatankers Management Co. Ltd |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | $ 1,641 | $ 6,037
SFL |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 2,668 | 2,206
Golden Ocean |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 2,409 | 3,311
Flex LNG Ltd |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 929 | 635
Seatankers Management Norway AS |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | (344) | (248)
Seadrill Limited |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 137 | 133
Archer Limited |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 74 | 225
Alta Trading UK Limited |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 1,018 | 23,558
Avance Gas |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 1,207 | 335
TFG Marine |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | 386 | 0
Other related parties |  |
Related Party Transaction [Line Items] |  |
Net amounts earned (incurred) from related parties excluding Ship Finance lease related balances | $ 90 | $ 76

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