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Fair Value Measurements (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
securitization
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
securitization
Sep. 30, 2015
USD ($)
Fair Value Disclosures [Abstract]        
Residual interests held from securitizations | securitization 3   3  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period     $ 11,115  
Total gains (losses) – realized/unrealized:        
Included in earnings     (6,830)  
Included in other comprehensive income     (4,454)  
Interest income on Residuals $ 384 $ 440 1,285 $ 1,332
Cash received from Residuals     (927)  
Purchases, sales, issuances and settlements, net     0  
Transfers in and/or out of Level 3     0  
Balance at end of period $ 189   189  
Changes in gains (losses) included in earnings attributable to a change in unrealized gains (losses) relating to Residuals still held at the end of period     $ 4,272