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8. Interest Income and Interest Expense (Details - Interest income) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of interest income      
Interest on finance receivables $ 423,567 $ 408,723 $ 349,796
Other interest income 607 273 116
Interest income $ 424,174 $ 408,996 $ 349,912