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LONG-TERM DEBT - Refinancing Activities (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2020
6.500% notes, due May 1, 2027        
Debt Instrument [Line Items]        
Notes   $ 325,000,000.0   $ 425,000,000.0
Interest accrual (percent)     6.50%  
Credit facility   425,000,000.0    
Debt issuance price, percentage of principal (percent)       105.00%
Revolver        
Debt Instrument [Line Items]        
Credit facility   89,000,000.0    
Term B-1 loan        
Debt Instrument [Line Items]        
Deferred finance costs written off $ 300,000 1,600,000    
New deferred financing costs recorded 3,800,000 3,900,000    
Write-off of unamortized premium   $ 200,000    
Repayments of debt 96,700,000      
6.500% senior secured second-lien notes due 2027 - Additional Notes        
Debt Instrument [Line Items]        
Notes $ 100,000,000.0      
Interest accrual (percent) 6.50%      
Until May 1, 2022 | 6.500% notes, due May 1, 2027        
Debt Instrument [Line Items]        
Redemption price, percentage of principal amount redeemed (percent)     106.50%  
On or after May 1, 2022 | 6.500% notes, due May 1, 2027        
Debt Instrument [Line Items]        
Redemption price, percentage of principal amount redeemed (percent)     104.875%