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DEBT (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) shares | Apr. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Feb. 28, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) very_large_crude_carrier large_range_2Tanker_vessel_type shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of marketable securities |  |  |  |  |  | $ 14,074 | $ 0 | $ 0
Marketable securities acquired |  |  |  |  |  | 357 | $ 0 | 0
Debt issuance costs, gross | $ 19,700 |  |  |  |  | 19,700 |  | 20,200
Assets pledged [Abstract] |  |  |  |  |  |  |  |
Vessels and equipment, net | 3,340,987 |  |  |  |  | 3,340,987 |  | 3,307,144
Vessels |  |  |  |  |  |  |  |
Assets pledged [Abstract] |  |  |  |  |  |  |  |
Vessels and equipment, net | $ 3,340,562 |  |  |  |  | $ 3,340,562 |  | $ 3,306,863
Golden Ocean |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of marketable securities (in shares) | shares |  |  |  |  |  |  |  | 1,270,657
Number of marketable securities pledged to creditors (in shares) | shares | 0 |  |  |  |  | 0 |  | 1,260,358
Secured debt, repurchase agreements | $ 9,800 |  | $ 6,200 |  |  | $ 9,800 |  |
Proceeds from sale of marketable securities | 700 |  | 9,800 |  | $ 13,400 |  |  |
Marketable securities acquired | 3,600 | $ 400 | 3,600 |  |  |  |  |
Senior unsecured facility $275.0 million | Other Affiliates Of Hemen |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 101,700 |  |
Number of vessels under construction | very_large_crude_carrier |  |  |  |  |  | 6 |  |
Senior unsecured facility $275.0 million | Loans Payable | Other Affiliates Of Hemen |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | 275,000 |  |  | $ 275,000 |  | $ 275,000 |  |
Extension period |  |  |  | 12 months |  | 12 months |  |
Debt instrument, unused borrowing capacity, amount | 113,300 |  |  |  |  | $ 113,300 |  |
Senior Secured Loan Facility, CEXIM And Sinosure |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 33,400 | $ 33,400 |  |  |  |  |
Maximum borrowing capacity | $ 133,700 |  |  |  |  | $ 133,700 |  |
Number of newbuild vessels financed by term loan facility | large_range_2Tanker_vessel_type |  |  |  |  |  | 2 |  |
Debt instrument, term |  |  |  |  |  | 12 years |  |
Interest rate amortization profile |  |  |  |  |  | 17 years |  |

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