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LONG-TERM DEBT - Senior Notes Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 26, 2017 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Interest expense |  |  | $ 24,194,000 | $ 27,340,000 | $ 28,759,000
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 325,000,000 |  |  |  |
Notes issued, interest rate | 5.50% |  |  |  |
Proceeds from issuance of senior long-term debt | $ 318,900,000 |  |  |  |
Debt instrument, redemption price, percentage |  |  | 101.00% |  |
Debt instrument, redemption price, percentage of principal amount outstanding |  |  | 60.00% |  |
Interest expense |  |  | $ 18,600,000 | $ 18,500,000 | $ 18,500,000
Repayments of long-term debt |  | $ 10,000,000.0 |  |  |
Senior Notes | Prior to October 1, 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, redemption price, percentage |  |  | 100.00% |  |
Debt instrument, redemption price, percentage of principal amount redeemed, threshold |  |  | 40.00% |  |
Debt instrument, redemption price, percentage for first threshold |  |  | 105.50% |  |
Senior Notes | Twelve-month period beginning October 1, 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, redemption price, percentage |  |  | 102.75% |  |
Senior Notes | Twelve-month period beginning October 1, 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, redemption price, percentage |  |  | 101.375% |  |
Senior Notes | Twelve-month period beginning on October 1, 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, redemption price, percentage |  |  | 100.00% |  |

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