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FINANCIAL INSTRUMENTS - Narrative (Details) $ in Thousands | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) instrument | Mar. 31, 2020 USD ($) instrument | Feb. 27, 2013 USD ($) instrument | Jun. 30, 2021 USD ($) instrument | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Feb. 29, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 561,318 |  |  |
Derivative instruments payable |  |  |  | 10,000 |  | $ 19,300 |
Debt issuance costs, gross |  |  |  | 19,700 |  | 20,200 |
Interest rate swap 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 150,000 |  |  | $ 150,000
DNB fixed rate swap |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Number of derivatives entered into | instrument |  | 3 |  |  |  |  |
Derivative, notional amount |  | $ 250,000 |  |  |  |  |
Nordea fixed rate swap |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Number of derivatives entered into | instrument | 2 |  |  |  |  |  |
Derivative, notional amount | $ 150,000 |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Number of derivatives entered into | instrument |  |  | 6 |  |  |  |
Number of derivatives outstanding | instrument |  |  |  | 1 |  |  |
Principal amount of debt used in interest rate swaps |  |  | $ 260,000 |  |  |  |
Derivative instruments receivable |  |  |  | $ 4,600 |  | $ 0 |
Gain/(loss) on derivative |  |  |  | $ 11,000 | $ (21,700) |  |

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