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LONG-TERM DEBT - Senior Debt (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Consolidated leverage ratio 3.0     3.0      
Refinancing expenses $ 0   $ 0 $ 473,000 $ 0    
Senior Notes              
Debt Instrument [Line Items]              
Consolidated leverage ratio 4.0     4.0      
Refinancing expenses   $ 500,000          
Senior Notes | Senior secured second-lien notes due 2027              
Debt Instrument [Line Items]              
Notes issued             $ 425,000,000
Interest rate on notes     6.50%        
Senior Notes | New Revolver              
Debt Instrument [Line Items]              
Long-term line of credit           $ 250,000,000  
Senior Notes | Credit Facility              
Debt Instrument [Line Items]              
Covenant effective period       1 year      
Senior Notes | Credit Facility | Maximum              
Debt Instrument [Line Items]              
Consolidated leverage ratio 4.5     4.5      
Senior Notes | 6.750% notes due March 31, 2029              
Debt Instrument [Line Items]              
Notes issued   540,000,000          
Debt issuance costs   6,600,000          
Senior Notes | Revolver              
Debt Instrument [Line Items]              
Repayments of debt   40,000,000          
Debt issuance costs attributable to the revolver   $ 400,000          
Senior Notes | 7.25% senior unsecured notes, due November 1, 2024              
Debt Instrument [Line Items]              
Debt instrument, stated percentage (percent)   7.25%          
Repayments of debt   $ 400,000,000          
Term Loan | Term B-2 Loan, due November 17, 2024              
Debt Instrument [Line Items]              
Repayments of debt   $ 77,000,000