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5. Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Components of interest income        
Interest on Finance Receivables $ 101,624 $ 84,872 $ 198,252 $ 167,193
Residual interest income 0 28 0 65
Other interest income 85 0 120 1
Interest income $ 101,709 $ 84,900 $ 198,372 $ 167,259