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Borrowings - Encore Private Placement Notes - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Aug. 31, 2017
Debt Instrument [Line Items]        
Debt issued   $ 583,500,000 $ 672,855,000  
Senior secured notes   1,651,619,000 $ 1,129,039,000  
2017 Senior Secured Notes | Term Loan Facility        
Debt Instrument [Line Items]        
Debt issued       $ 325,000,000.0
Senior secured notes   $ 146,600,000    
Stated interest rate   5.625%    
Senior Secured Notes, periodic principal repayment   $ 9,800,000    
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security $ 103,700,000      
Repayment of Long-term Debt, Make-whole Payment $ 10,400,000