Consolidated Securitization Vehicles (Details 9) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Book Value, net			$ 19,282
Securitization Vehicles
Principal Balance	292,828		815,716
Book Value	214,457		620,030
Number of Loans	14		71
Book Value, net	214,457		612,598
Unallocated loan loss provision		[1]	(7,432)	[1]
Securitization Vehicles | Risk Rating 1-3
Principal Balance	118,333		416,032
Book Value	118,006		415,661
Number of Loans	5		22
Securitization Vehicles | Risk Rating 4-5
Principal Balance	78,700		44,057
Book Value	78,622		43,945
Number of Loans	2		3
Securitization Vehicles | Risk Rating 6-8
Principal Balance	95,795		271,988
Book Value	17,829		76,784
Number of Loans	7		17
Securitization Vehicles | Risk Rating NA
Principal Balance			83,639
Book Value			83,640
Number of Loans			29
Securitization Vehicles | Senior Mortgages
Principal Balance	65,000		257,630
Book Value	65,000		241,323
Number of Loans	1		44
Securitization Vehicles | Senior Mortgages | Risk Rating 1-3
Principal Balance			117,452
Book Value			117,452
Number of Loans			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			43,988
Book Value			27,680
Number of Loans			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	207,790		329,372
Book Value	129,509		225,773
Number of Loans	12		19
Securitization Vehicles | Subordinated interests in mortgages | Risk Rating 1-3
Principal Balance	98,295		175,560
Book Value	98,058		175,314
Number of Loans	4		8
Securitization Vehicles | Subordinated interests in mortgages | Risk Rating 4-5
Principal Balance	13,700		31,506
Book Value	13,622		31,394
Number of Loans	1		2
Securitization Vehicles | Subordinated interests in mortgages | Risk Rating 6-8
Principal Balance	95,795		122,306
Book Value	17,829		19,065
Number of Loans	7		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	20,038		123,020
Book Value	19,948		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	20,038		228,714
Book Value	$ 19,948		$ 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.