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FINANCIAL INSTRUMENTS - Narrative (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 27, 2013 USD ($) instrument | Dec. 31, 2019 USD ($) suezmax_tanker | Dec. 31, 2018 USD ($) very_large_crude_carrier | Dec. 31, 2017 USD ($) very_large_crude_carrier | Dec. 31, 2019 very_large_crude_carrier | Dec. 31, 2019 USD ($) | Dec. 31, 2019 | Dec. 31, 2019 large_range_2_tanker | Dec. 31, 2019 types_of_risk | Dec. 31, 2017 large_range_2_tanker | Dec. 31, 2016 USD ($) MR_product_tanker | Feb. 29, 2016 USD ($) | Feb. 01, 2013 MR_product_tanker
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of newbuild vessels |  | 1 | 2 | 4 | 1 |  |  | 4 |  | 1 | 6 |  | 12
Debt |  |  | $ 1,740,552,000 |  |  | $ 1,701,341,000 |  |  |  |  |  |  |
Mark to market loss (gain) on derivatives |  | $ 11,757,000 | (3,190,000) | $ (93,000) |  |  |  |  |  |  |  |  |
Number of risks related to subsidiaries' reporting in foreign currency | types_of_risk |  |  |  |  |  |  |  |  | 2 |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of derivatives entered into | instrument | 6 |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt used in interest rate swaps | $ 260,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 306,182,000 |  |  |  |  |  |  |
Derivative asset |  |  | 7,600,000 |  |  | 100,000 |  |  |  |  |  |  |
Derivative liability |  |  | 0 |  |  | 4,300,000 |  |  |  |  |  |  |
Mark to market loss (gain) on derivatives |  | $ 10,100,000 | $ (4,300,000) | $ 800,000 |  |  |  |  |  |  |  |  |
Interest rate swap 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 12,892,000 |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  | 1.4025% |  |  |  |  |  |
Interest rate swap 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 38,546,000 |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  | 1.5035% |  |  |  |  |  |
Interest rate swap 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 65,645,000 |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  | 1.6015% |  |  |  |  |  |
Interest rate swap 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 12,690,000 |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  | 1.6998% |  |  |  |  |  |
Interest rate swap 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 13,033,000 |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  | 1.7995% |  |  |  |  |  |
Interest rate swap 6 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 13,376,000 |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  | 1.907% |  |  |  |  |  |
Interest rate swap 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  | $ 150,000,000 |
Derivative, fixed interest rate |  |  |  |  |  |  | 2.197% |  |  |  |  |  |
Term Loan Facility, $466.5 Million [Member] | US Dollar denominated floating rate debt |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  | $ 466,500,000 |  |

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