Previously Consolidated Variable Interest Entities (Details 6) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Book Value, net	$ 141,500	$ 838,394
Previously Consolidated Variable Interest Entities
Book Value		681,053
Unallocated loan loss provision		(7,432)	[1]
Book Value, net		673,621
Previously Consolidated Variable Interest Entities | Loans Receivable
Principal Balance		1,023,538
Book Value		681,053
Number of Loans		76
Unallocated loan loss provision		(7,432)	[1]
Book Value, net		673,621
Previously Consolidated Variable Interest Entities | Senior Mortgage Loans
Principal Balance		283,702
Book Value		254,309
Number of Loans		48
Previously Consolidated Variable Interest Entities | Subordinated interests in mortgages
Principal Balance		288,776
Book Value		203,360
Number of Loans		14
Previously Consolidated Variable Interest Entities | Mezzanine and Other Loans
Principal Balance		451,060
Book Value		223,384
Number of Loans		14
Previously Consolidated Variable Interest Entities | Risk Rating 1-3
Principal Balance		365,770
Book Value		365,792
Number of Loans		22
Previously Consolidated Variable Interest Entities | Risk Rating 1-3 | Senior Mortgage Loans
Principal Balance		79,955
Book Value		79,955
Number of Loans		10
Previously Consolidated Variable Interest Entities | Risk Rating 1-3 | Subordinated interests in mortgages
Principal Balance		111,358
Book Value		111,112
Number of Loans		5
Previously Consolidated Variable Interest Entities | Risk Rating 1-3 | Mezzanine and Other Loans
Principal Balance		174,457
Book Value		174,725
Number of Loans		7
Previously Consolidated Variable Interest Entities | Risk Rating 4-5
Principal Balance		108,208
Book Value		108,072
Number of Loans		8
Previously Consolidated Variable Interest Entities | Risk Rating 4-5 | Senior Mortgage Loans
Principal Balance		33,551
Book Value		33,527
Number of Loans		3
Previously Consolidated Variable Interest Entities | Risk Rating 4-5 | Subordinated interests in mortgages
Principal Balance		56,037
Book Value		55,925
Number of Loans		3
Previously Consolidated Variable Interest Entities | Risk Rating 4-5 | Mezzanine and Other Loans
Principal Balance		18,620
Book Value		18,620
Number of Loans		2
Previously Consolidated Variable Interest Entities | Risk Rating 6-8
Principal Balance		465,921
Book Value		123,549
Number of Loans		17
Previously Consolidated Variable Interest Entities | Risk Rating 6-8 | Senior Mortgage Loans
Principal Balance		86,557
Book Value		57,187
Number of Loans		6
Previously Consolidated Variable Interest Entities | Risk Rating 6-8 | Subordinated interests in mortgages
Principal Balance		121,381
Book Value		36,323
Number of Loans		6
Previously Consolidated Variable Interest Entities | Risk Rating 6-8 | Mezzanine and Other Loans
Principal Balance		257,983
Book Value		30,039
Number of Loans		5
Previously Consolidated Variable Interest Entities | Risk Rating NA
Principal Balance		83,639
Book Value		83,640
Number of Loans		29
Previously Consolidated Variable Interest Entities | Risk Rating NA | Senior Mortgage Loans
Principal Balance		83,639
Book Value		$ 83,640
Number of Loans		29

[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 to overall pool of loans. See Note 2 for additional details.