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LONG-TERM DEBT - 5 1/2% Senior Notes (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gain (loss) on extinguishment of debt |  | $ (1,481,000) | $ (1,676,000) | $ (2,493,000)
5½% Senior Notes | Senior Notes |  |  |  |
Stated interest rate |  | 5.50% |  |
Early repayment of senior debt | $ 300,000,000.0 |  |  |
Debt Instrument, redemption price, percentage | 100.00% |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (1,700,000) |

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