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Fair Value Measurements (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
securitization
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
securitization
Jun. 30, 2014
USD ($)
Fair Value Disclosures [Abstract]        
Residual interests held from securitizations | securitization 7   7  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period     $ 11,626  
Included in earnings     (428)  
Included in other comprehensive income     (384)  
Interest income on Residuals $ 447 $ 454 892 $ 906
Cash received from Residuals     (874)  
Purchases, sales, issuances and settlements, net     0  
Transfers in and/or out of Level 3     0  
Balance at end of period $ 10,832   10,832  
Changes in gains (losses) included in earnings attributable to a change in unrealized gains (losses) relating to assets still held at the end of period     $ 246