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6. Interest Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Components of interest income        
Interest on Finance Receivables $ 73,781 $ 60,462 $ 206,761 $ 167,416
Residual interest income 84 0 320 0
Other interest income 0 0 1 10
Interest income $ 73,865 $ 60,462 $ 207,082 $ 167,426