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FINANCIAL INSTRUMENTS - Summary of interest rate swaps (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Feb. 29, 2016
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Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 561,318 |
Interest rate swap 1 |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 11,318 |
Derivative, fixed interest rate (as a percent) | 1.907% |
Interest rate swap 2 |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 150,000 | $ 150,000
Derivative, fixed interest rate (as a percent) | 2.197% |
Interest rate swap 3 |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 100,000 |
Derivative, fixed interest rate (as a percent) | 0.975% |
Interest rate swap 4 |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 50,000 |
Derivative, fixed interest rate (as a percent) | 0.60% |
Interest rate swap 5 |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 100,000 |
Derivative, fixed interest rate (as a percent) | 0.90% |
Interest rate swap 6 |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 100,000 |
Derivative, fixed interest rate (as a percent) | 0.597% |
Interest rate swap 7 |  |
Debt Instrument [Line Items] |  |
Derivative, notional amount | $ 50,000 |
Derivative, fixed interest rate (as a percent) | 0.50% |

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