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OTHER OPERATING GAINS - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) vessel suezmax_tanker | Dec. 31, 2018 USD ($) very_large_crude_carrier | Dec. 31, 2017 suezmax_tanker | Dec. 31, 2017 very_large_crude_carrier | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |
Insurance recoveries | $ 3,737 | $ 0 |  |  | $ 0
Other gains | 628 | 0 |  |  | 0
Gain on pooling arrangements | 600 | $ 100 |  |  |
Number of vessels with terminated leases |  | 6 | 2 | 2 |
Gain on termination of vessel leases | 0 | $ 10,324 |  |  | $ 2,379
SFL |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Loss on pooling arrangements | $ 1,500 | $ 200 |  |  |
Number of owned pooled assets | suezmax_tanker | 2 |  |  |  |
Number of third party pooled assets | vessel | 2 |  |  |  |

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