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8. Interest Income and Interest Expense (Details - Interest income) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of interest income      
Interest on finance receivables $ 334,634 $ 423,567 $ 408,723
Interest on finance receivables at fair value 43,863 0 0
Other interest income 1,800 607 273
Interest income $ 380,297 $ 424,174 $ 408,996