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5. Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Components of interest income        
Interest on Finance Receivables $ 105,296 $ 90,564 $ 303,548 $ 257,757
Residual interest income 0 20 0 85
Other interest income 80 0 200 1
Interest income $ 105,376 $ 90,584 $ 303,748 $ 257,843