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2. Finance Receivables (Details-Allowance for finance credit losses) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Finance Receivables        
Balance at beginning of period $ 74,541 $ 53,326 $ 61,460 $ 39,626
Provision for credit losses on finance receivables 37,411 27,287 106,533 76,795
Charge-offs (38,608) (29,988) (105,273) (80,514)
Recoveries 5,415 3,996 16,039 18,714
Balance at end of period $ 78,759 $ 54,621 $ 78,759 $ 54,621