3. Finance Receivables (Details-Allowance for finance credit losses) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finance Receivables
Balance at beginning of period	$ 75,603	$ 61,460	$ 39,626
Provision for credit losses on finance receivables	178,511	142,618	108,228
Charge-offs	(192,366)	(156,553)	(109,914)
Recoveries	33,830	28,078	23,520
Balance at end of period	$ 95,578	$ 75,603	$ 61,460