Debt Obligations (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Accretable Yield Movement on Acquired Securitized Financings
Additions		$ 32,072
Accretion	(1,398)	(726)
Balance at the beginning of the period	26,032
Balance at the end of the period	$ 24,634	$ 31,346