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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value inputs, fluctuation in cost to collect and discount rate   100.00%    
Convertible senior notes, carrying value $ 483,500 $ 483,500 $ 483,500  
Senior secured notes, carrying value 325,000 325,000 326,029  
Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Convertible senior notes, carrying value 455,700 455,700 450,800  
Senior Notes | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value estimate of convertible senior notes incorporates quoted market prices 475,200 475,200 520,900  
Secured Debt        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Senior secured notes, carrying value 1,186,200 1,186,200 1,214,600  
Secured Debt | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of senior notes 1,202,400 1,202,400 1,258,900  
United States        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Increase or decrease of the fair value (100 basis points)   55,100    
Europe        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Increase or decrease of the fair value (100 basis points)   71,300    
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 3,195,900 3,195,900 3,415,300  
Carrying 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 3,084,600 3,084,600 2,890,600  
Contingent Consideration        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contingent consideration 6,993 6,993 $ 10,612 $ 2,531
Contingent Consideration | General and administrative expenses        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Issuance (reversal) of contingent consideration in connection with acquisition $ (2,400) $ (4,700)