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INVESTMENTS IN DEBT AND EQUITY SECURITIES (Equity instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Equity securities | $ 14,512 | $ 19,374
Equity securities pledged to creditors | 13,032 | 9,007
Frontline |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Equity securities | 13,032 | 9,007
NorAm Drilling |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Equity securities | 1,480 | 1,484
ADS Maritime Holding |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Equity securities | $ 0 | $ 8,883

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