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Notes Payable Schedule of structured financing notes at fair value (Details) - USD ($)
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total structured financing notes reported at fair value that are secured by credit card receivables and to which we are subordinated $ 15,626,000 $ 20,970,000
Weighted average interest rate [1] 5.10% 5.40%
Credit card receivables and restricted cash carrying amount as security for notes payable $ 15,600,000  
Maximum Aggregate Exposure to Pretax Equity Loss Associated With Structured Financing at Fair Value 0  
Amortizing Securitization Facility Expiration Date December 1, 2015 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 103,700,000.0 $ 107,000,000.0
Weighted average interest rate 5.80% 5.60%
Credit card receivables and restricted cash carrying amount as security for notes payable $ 15,600,000.0 $ 21,000,000
Maturity date Dec. 01, 2021  
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Total structured financing notes reported at fair value that are secured by credit card receivables and to which we are subordinated $ 15,600,000  
Notes Payable to Banks [Member] | Amortizing Securitization Facility Expiration Date December 1, 2015 [Member]    
Debt Instrument [Line Items]    
Total structured financing notes reported at fair value that are secured by credit card receivables and to which we are subordinated $ 15,600,000 $ 21,000,000
[1] Loans are subject to certain affirmative covenants tied to default rates and other performance metrics the failure of which could result in required early repayment of the remaining unamortized balances of the notes.