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LONG-TERM DEBT - Senior Unsecured Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 17, 2017
Debt Instrument [Line Items]          
Amortization of debt discount (premium)   $ (1,582) $ (3,395) $ (2,928)  
Term B-2 Loan, Due November 17, 2024          
Debt Instrument [Line Items]          
Deferred finance costs written off $ 1,300        
Senior Unsecured Debt | 7.250% senior unsecured notes, due November 1, 2024          
Debt Instrument [Line Items]          
Debt instrument, stated percentage (percent)         7.25%
Debt, face amount         $ 400,000
Amortization of debt discount (premium) (14,500)        
Write-off of unamortized premium 8,700        
Deferred finance costs written off $ 1,000