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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets held for sale $ 31,088 $ 26,664    
Investment in receivable portfolios, carrying value $ 3,211,587 3,137,893 $ 3,024,141 $ 2,890,613
Fair value inputs, fluctuation in cost to collect and discount rate 1.00%      
Deferred court costs, net $ 96,207 95,918    
Convertible senior notes, carrying value 656,000 656,000    
Debt discount (33,239) (36,361)    
Senior secured notes, carrying value 325,000 325,000    
Term Loan Facility        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Convertible senior notes, carrying value 622,761 619,639    
Debt discount (33,239) (36,361)    
Term Loan Facility | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value estimate of convertible senior notes incorporates quoted market prices 600,558 553,744    
United States        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Increase or decrease of the fair value (100 basis points) 49,900      
Europe        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Increase or decrease of the fair value (100 basis points) 71,500      
Fair Value | Certain Loans Acquired in Transfer Not Accounted for as Debt Securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of investment receivable portfolios 3,413,480 3,525,861    
Cabot Senior Secured Notes | Term Loan Facility        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt discount (1,392) (1,477)    
Senior secured notes, carrying value 1,120,657 1,111,399    
Cabot Senior Secured Notes | Secured Debt        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior secured notes, carrying value 1,119,265 1,109,922    
Cabot Senior Secured Notes | Secured Debt | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of senior notes $ 1,103,966 $ 1,036,905