Previously Consolidated Variable Interest Entities (Details 14) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 ExcludingSecuritizationVehiclesMember Interest Rate Swaps		Dec. 31, 2011 ExcludingSecuritizationVehiclesMember Interest Rate Swaps JPMorgan Chase		Dec. 31, 2011 ExcludingSecuritizationVehiclesMember Interest Rate Swaps JPMorgan Chase 1		Dec. 31, 2011 ExcludingSecuritizationVehiclesMember Interest Rate Swaps JPMorgan Chase 2		Dec. 31, 2011 ExcludingSecuritizationVehiclesMember Interest Rate Swaps JPMorgan Chase 3		Dec. 31, 2011 ExcludingSecuritizationVehiclesMember Interest Rate Swaps JPMorgan Chase 4
Notional Amount			$ 60,806		$ 17,574		$ 16,565		$ 16,441		$ 7,062		$ 3,164
Fair Value		$ 33,759	$ (8,817)		$ (1,887)		$ (1,889)		$ (3,321)		$ (1,189)		$ (531)
Interest Rate			5.17%	[1]	5.14%	[1]	4.83%	[1]	5.52%	[1]	5.11%	[1]	5.45%	[1]
Derivative Counterparty					JP Morgan Chas		JP Morgan Chas		JP Morgan Chas		JP Morgan Chas		JP Morgan Chas
Derivative Maturity			Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2014		Dec. 31, 2018		Dec. 31, 2016		Dec. 31, 2015

[1] Represents the gross fixed interest rate we pay to our counterparties under these derivative instruments. We receive an amount of interest indexed to one-month LIBOR on all of our interest rate swaps.