6. Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of interest income
Interest on Finance Receivables	$ 84,872	$ 68,098	$ 167,193	$ 132,980
Residual interest income	28	123	65	236
Other interest income	0	0	1	1
Interest income	$ 84,900	$ 68,221	$ 167,259	$ 133,217