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MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Marketable securities acquired |  |  |  |  | $ 357 | $ 0 | $ 0
Proceeds from sale of marketable securities |  |  |  |  | 14,074 | $ 0 | 0
Gain on sale of marketable securities |  |  |  |  | 7,881 |  | $ 0
Golden Ocean |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Unrealized (loss)/gain on investments |  |  |  |  | $ 100 |  |
Number of marketable securities (in shares) |  |  |  |  |  |  | 1,270,657
Number of marketable securities pledged to creditors (in shares) | 0 |  |  |  | 0 |  | 1,260,358
Secured debt, repurchase agreements | $ 9,800 |  | $ 6,200 |  | $ 9,800 |  |
Marketable securities acquired | 3,600 | $ 400 | 3,600 |  |  |  |
Proceeds from sale of marketable securities | 700 |  | $ 9,800 | $ 13,400 |  |  |
Gain on sale of marketable securities | $ 300 |  |  |  | $ 7,600 |  |
Marketable securities, from exercise of subscription rights |  | 55,959 |  |  |  |  |
Marketable securities, number of shares held (in shares) | 10,299 |  |  |  | 10,299 |  |
Avance Gas |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Unrealized (loss)/gain on investments |  |  |  |  | $ (100) |  |
Number of marketable securities (in shares) |  |  |  |  | 400,000 |  |
SFL |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Unrealized (loss)/gain on investments |  |  |  |  | $ 100 |  |
Number of marketable securities (in shares) |  |  |  |  | 100,000 |  |

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