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6. Interest Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Components of interest income    
Interest on Finance Receivables $ 64,882 $ 51,159
Residual interest income 113 0
Other interest income 1 9
Interest income $ 64,996 $ 51,168