CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 846	$ (415)	$ 2,190	$ (570)
Change in unrealized appreciation of retained interests in transferred assets:
Net unrealized appreciation (depreciation) arising during period	21	(31)	58	(40)
Net realized gains included in net income (loss)	(22)	(30)	(45)	(66)
Change in unrealized appreciation of retained interests in transferred assets	(1)	(61)	13	(106)
Comprehensive income (loss)	$ 845	$ (476)	$ 2,203	$ (676)