Debt Obligations (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011
Acquired Securitized Financings
Securitized financings - contractual amount	$ 110,401		$ 117,507
Purchase Discount
Accretable	(23,679)	(24,634)	(26,032)	(29,779)	(31,346)	0
Non-accretable	0		0
Total securitized financings, net	$ 86,722		$ 91,475