Consolidated Securitization Vehicles (Details 9) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Book Value, net	$ 1,619		$ 19,282
Securitization Vehicles
Principal Balance	339,808		815,716
Book Value	241,644		620,030
Number of Loans	18		71
Book Value, net	241,644		612,598
Unallocated loan loss provision		[1]	(7,432)	[1]
Securitization Vehicles | Risk Rating 1-3
Principal Balance	142,651		416,032
Book Value	142,309		415,661
Number of Loans	7		22
Securitization Vehicles | Risk Rating 4-5
Principal Balance	78,700		44,057
Book Value	78,610		43,945
Number of Loans	2		3
Securitization Vehicles | Risk Rating 6-8
Principal Balance	118,457		271,988
Book Value	20,725		76,784
Number of Loans	9		17
Securitization Vehicles | Risk Rating NA
Principal Balance			83,639
Book Value			83,640
Number of Loans			29
Securitization Vehicles | Senior Mortgages
Principal Balance	69,383		257,630
Book Value	69,383		241,323
Number of Loans	3		44
Securitization Vehicles | Senior Mortgages | Risk Rating 1-3
Principal Balance	2,774		117,452
Book Value	2,774		117,452
Number of Loans	1		10
Securitization Vehicles | Senior Mortgages | Risk Rating 4-5
Principal Balance	65,000		12,551
Book Value	65,000		12,551
Number of Loans	1		1
Securitization Vehicles | Senior Mortgages | Risk Rating 6-8
Principal Balance	1,609		43,988
Book Value	1,609		27,680
Number of Loans	1		4
Securitization Vehicles | Senior Mortgages | Risk Rating NA
Principal Balance			83,639
Book Value			83,640
Number of Loans			29
Securitization Vehicles | Subordinated interests in mortgages
Principal Balance	250,309		329,372
Book Value	152,247		225,773
Number of Loans	14		19
Securitization Vehicles | Subordinated interests in mortgages | Risk Rating 1-3
Principal Balance	119,761		175,560
Book Value	119,521		175,314
Number of Loans	5		8
Securitization Vehicles | Subordinated interests in mortgages | Risk Rating 4-5
Principal Balance	13,700		31,506
Book Value	13,610		31,394
Number of Loans	1		2
Securitization Vehicles | Subordinated interests in mortgages | Risk Rating 6-8
Principal Balance	116,848		122,306
Book Value	19,116		19,065
Number of Loans	8		9
Securitization Vehicles | Subordinated interests in mortgages | Risk Rating NA
Principal Balance
Book Value
Securitization Vehicles | Mezzanine & Other Loans | Risk Rating 1-3
Principal Balance	20,116		123,020
Book Value	20,014		122,895
Number of Loans	1		4
Securitization Vehicles | Mezzanine & Other Loans | Risk Rating 4-5
Principal Balance
Book Value
Securitization Vehicles | Mezzanine & Other Loans | Risk Rating 6-8
Principal Balance			105,694
Book Value			30,039
Number of Loans			4
Securitization Vehicles | Mezzanine & Other Loans | Risk Rating NA
Principal Balance
Book Value
Securitization Vehicles | Mezzanine Loans
Principal Balance	20,116		228,714
Book Value	$ 20,014		$ 152,934
Number of Loans	1		8

[1] We have recorded a general provision for loan losses against certain pools of smaller loans in our consolidated securitization vehicles. This general provision is not specifically allocable to any loan asset type, collateral property type, or geographic location, but rather to an overall pool of loans. See Note 2 for additional details.