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Investment in Receivable Portfolios, Net - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Face Value Of Receivable Portfolios $ 2,870,456,000   $ 2,441,909,000   $ 4,670,260,000 $ 4,099,302,000
Purchases of receivable portfolios $ 359,580,000   $ 246,415,000   $ 636,342,000 $ 465,142,000
Face value on purchase cost 12.50%   10.10%   13.60% 11.30%
Estimated Future Collections At Acquisition For Receivable Portfolios $ 704,400,000   $ 505,000,000   $ 1,260,600,000 $ 924,400,000
Revenue recognized, net (292,662,000) $ (281,009,000) (263,407,000) $ (249,838,000) (573,671,000) (513,245,000)
Allowance reversals on receivable portfolios, net 17,632,000 (9,811,000) 8,829,000 (2,132,000) 27,443,000 10,961,000
Estimate of Zero Basis Cash Flows            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Revenue recognized, net (33,964,000) (31,188,000) (39,097,000) (38,733,000)    
Allowance reversals on receivable portfolios, net 2,221,000 $ (1,729,000) 1,708,000 $ (1,519,000)    
Zero Basis Portfolios            
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]            
Purchases of receivable portfolios 0   0   0 0
Revenue recognized, net (33,964,000)   (39,097,000)   (65,152,000) (77,830,000)
Allowance reversals on receivable portfolios, net $ 2,221,000   $ 1,708,000   $ 3,950,000 $ 3,227,000