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Fair Value Measurements - Schedule of Financial Instruments Not Required to Be Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment in receivable portfolios $ 3,291,918 $ 3,283,984
Deferred court costs 0 100,172
Carrying Amount | Convertible notes and exchangeable notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Convertible notes and exchangeable notes 564,136 642,547
Carrying Amount | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior secured notes 1,642,058 1,127,435
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment in receivable portfolios 3,705,672 3,464,050
Deferred court costs 0 100,172
Estimated Fair Value | Convertible notes and exchangeable notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Convertible notes and exchangeable notes 622,081 693,708
Estimated Fair Value | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Senior secured notes $ 1,684,729 $ 1,170,945