Non-Recourse and Limited Recourse Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Long-term Debt, by Maturity [Abstract]
2012 (remainder)	$ 12,903
2013	32,729
2014	30,334
2015	62,637
2016	280,151
Thereafter through 2031	858,233
Long-term Debt	1,276,987
Unamortized Discount	(813)	[1]
Total	$ 1,276,174		$ 1,154,254

[1] Represents the unamortized discount on two notes.