11. Fair Value measurements (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Residual Interest in Securitizations:
Balance at beginning of period	$ 4,824	$ 4,414
Cash paid (received) during period	(1,319)	(26)
Included in earnings		224
Balance at end of period	3,505	4,612
Warrant Derivative Liability:
Balance at beginning of period	355	967
Included in earnings	228	203
Reclassification to equity	(583)	(1,056)
Balance at end of period		$ 114