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MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Secured debt, repurchase agreements |  |  |  |  |  | $ 7,700 |  | $ 7,700 |
Shares committed | $ 7,323 |  |  |  |  | $ 8,392 | $ 7,323 | 8,392 |
Gain (loss) from marketable securities reclassified to Consolidated Statement of Operations |  |  |  |  |  |  | 0 | 0 | $ 571
Avance Gas |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  | 1,900 | (600) |
Golden Ocean |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  | $ (400) | $ (2,500) |
Number of shares held (in shares) | 1,300,000 |  |  |  |  | 1,300,000 | 1,300,000 | 1,300,000 |
Proceeds from sale of marketable securities | $ 7,200 | $ 7,600 | $ 6,700 | $ 6,600 |  |  |  |  |
Forward contract, number of shares to be repurchased (in shares) | 1,300,000 | 1,300,000 | 1,300,000 | 1,300,000 |  |  |  |  |
Secured debt, repurchase agreements | $ 7,200 | $ 7,600 | $ 6,700 | $ 6,600 | $ 6,600 |  | $ 7,200 |  |
Payments to acquire marketable securities | 500 | $ 1,200 | $ 100 | $ 1,000 |  |  |  |  |
Liability for marketable securities transaction | $ 7,300 |  |  |  |  |  | 7,300 |  |
DHT Holdings |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  |  |  | 3,000
Proceeds from sale of marketable securities |  |  |  |  |  |  |  | $ 17,800 | $ 27,400
Number of shares disposed (in shares) |  |  |  |  |  |  |  | 4,700,000 | 6,200,000
Available for sale securities, number of shares acquired (in shares) |  |  |  |  |  |  |  |  | 10,900,000
Payments to acquire available for sale securities |  |  |  |  |  |  |  |  | $ 46,100
Marketable securities, gain (loss) |  |  |  |  |  |  |  | $ 1,000 | 1,100
Gain (loss) from marketable securities reclassified to Consolidated Statement of Operations |  |  |  |  |  |  |  |  | $ 600
SFL |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  | $ 300 | $ (400) |
Number of shares held (in shares) | 100,000 |  |  |  |  | 100,000 | 100,000 | 100,000 |
Avance Gas |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Marketable securities (in shares) |  |  |  |  |  |  | 442,384 | 442,384 | 442,384
SFL |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Marketable securities (in shares) |  |  |  |  |  |  | 73,165 | 73,383 |
Golden Ocean |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Marketable securities (in shares) |  |  |  |  |  |  | 1,270,657 | 1,270,657 |
Proceeds from sale of marketable securities |  |  |  |  | $ 7,700 | $ 7,700 | $ 7,600 | $ 7,700 |
Number of shares disposed (in shares) |  |  |  |  |  | 1,300,000 | 1,300,000 | 1,300,000 |
Shares committed |  |  |  |  |  | $ 7,600 |  | $ 7,600 |
Number of shares pledged to creditors (in shares) | 1,260,358 |  |  |  |  |  | 1,260,358 |  |

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