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5. Interest Income and Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Components of interest income    
Interest on finance receivables $ 97,188 $ 104,496
Interest on finance receivables at fair value 3,508 0
Other interest income 210 79
Interest income $ 100,906 $ 104,575