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Borrowings - Encore Private Placement Notes - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Aug. 31, 2017
Debt Instrument [Line Items]      
Debt issued $ 422,500,000 $ 583,500,000  
Encore private placement notes | Notes Payable, Other Payables      
Debt Instrument [Line Items]      
Debt issued     $ 325,000,000.0
Long-term debt $ 136,780,000 $ 146,550,000  
Stated interest rate (as a percent) 5.625%    
Senior secured notes, periodic principal repayment $ 9,800,000