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LONG-TERM DEBT - Senior Debt (Details)
3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
Debt Instrument [Line Items]      
Consolidated leverage ratio     2.5
Senior secured second-lien notes due 2027      
Debt Instrument [Line Items]      
Medium-term notes $ 425,000,000.0 $ 325,000,000.0  
Interest rate on notes   6.50%  
Redemption rate as a percentage of principal amount   106.50%  
Percentage of principal amount 105.00%    
Senior secured second-lien notes due 2027 | Minimum      
Debt Instrument [Line Items]      
Prepayment premium   100.00%  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Long-term line of credit   $ 89,000,000.0  
Senior secured second-lien notes due 2027 - Additional Notes      
Debt Instrument [Line Items]      
Medium-term notes $ 100,000,000.0    
Interest rate on notes 6.50%    
Term B-1 loan      
Debt Instrument [Line Items]      
Repayments of debt $ 96,700,000 $ 425,000,000.0  
Senior Debt Obligations      
Debt Instrument [Line Items]      
Consolidated leverage ratio     4.0
Senior Debt Obligations | New Revolver      
Debt Instrument [Line Items]      
Long-term line of credit 250,000,000.0    
Line of credit facility, fair value of amount outstanding 227,300,000    
Senior Debt Obligations | Term B-2 Loan, due November 17, 2024      
Debt Instrument [Line Items]      
Long-term line of credit $ 770,000,000.0    
Annual payments as percentage of original principal amount. 1.00%    
Senior Debt Obligations | Original Revolver      
Debt Instrument [Line Items]      
Long-term line of credit $ 250,000,000.0    
Line of credit facility, fair value of amount outstanding $ 22,700,000    
Senior Debt Obligations | Credit Facility      
Debt Instrument [Line Items]      
Covenant effective period     1 year
Senior Debt Obligations | Credit Facility | Maximum      
Debt Instrument [Line Items]      
Consolidated leverage ratio     4.5