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11. Fair Value measurements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Finance Receivables Measured at Fair Value:
Balance at beginning of period	$ 43,021	$ 126,923	$ 59,668	$ 160,253
Payments on finance receivables at fair value	(11,461)	(27,607)	(27,980)	(64,103)
Charge-offs on finance receivables at fair value	(739)	(1,547)	(1,740)	(4,050)
Discount accretion	98	1,239	984	5,049
Mark to fair value	(600)	3,358	(613)	5,217
Balance at end of period	30,319	102,366	30,319	102,366
Balance at beginning of period	40,387	133,017	57,107	166,828
Principal payments on debt at fair value	(14,614)	(34,091)	(32,544)	(73,289)
Premium accretion	452	2,126	1,556	5,108
Mark to fair value	(603)	3,610	(497)	6,015
Balance at end of period	25,622	104,662	25,622	104,662
Reduction for principal payments collected and payable	(3,715)	(9,452)	(3,715)	(9,452)
Adjusted balance at end of period	$ 21,907	$ 95,210	$ 21,907	$ 95,210