Schedule IV Mortgage Loans on Real Estate (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Prior Liens	$ 404,239	[1]
Face Amount of Loans	164,180	[2]
Carrying Amount of Loans	141,500	[3],[4]
Mortgage - Total
Prior Liens		[1]
Face Amount of Loans	62,500	[2]
Carrying Amount of Loans	62,500	[3],[4]
Subordinate Interests in Mortgage - Total
Prior Liens	404,239	[1]
Face Amount of Loans	101,680	[2]
Carrying Amount of Loans	79,000	[3],[4]
Office Building [Member] | Mortgage - Borrower A
Location	California
Interest rate	1.10%	[5]
Final Maturity Date	May 03, 2013
Periodic Payment Terms	P & I	[6]
Face Amount of Loans	62,500	[2]
Carrying Amount of Loans	62,500	[3],[4]
Office Building [Member] | Subordinate Interests in Mortgage - Borrower B
Location	New York
Interest rate	9.70%	[5]
Final Maturity Date	Oct. 09, 2013
Periodic Payment Terms	I/O	[6]
Prior Liens	80,000	[1]
Face Amount of Loans	27,000	[2]
Carrying Amount of Loans	27,000	[3],[4]
Office Building [Member] | Subordinate Interests in Mortgage - Borrower C
Location	Diversified
Interest rate	5.30%	[5]
Final Maturity Date	Oct. 09, 2013
Periodic Payment Terms	I/O	[6]
Prior Liens	57,550	[1]
Face Amount of Loans	20,000	[2]
Carrying Amount of Loans	20,000	[3],[4]
Hotel [Member] | Subordinate Interests in Mortgage - Borrower D
Location	Hawaii
Interest rate	7.50%	[5]
Final Maturity Date	Jul. 09, 2014
Periodic Payment Terms	I/O	[6]
Prior Liens	266,689	[1]
Face Amount of Loans	30,000	[2]
Carrying Amount of Loans	30,000	[3],[4]
Other | Subordinate Interests in Mortgage - All Individually less than 3%
Interest rate - min	1.70%	[5]
Interest rate - max	5.20%	[5]
Final Maturity Date	Feb. 09, 2013
Final Maturity Date - earliest	Nov. 09, 2011
Face Amount of Loans	24,680	[2]
Carrying Amount of Loans	$ 2,000	[3],[4]

[1] Represents only third party liens.

[2] Mortgage loans which are greater than 90 days delinquent include $17.1 million of our subordinate interests in mortgages.

[3] Mortgage loans with a carrying value of $62.5 million are not consolidated for federal income tax purposes because they are held by securitization vehicles in which we invest, as further described in Note 5. Excluding these loans, the tax basis of the mortgage loans included above is approximately $80.3 million as of December 31, 2012.

[4] As of December 31, 2012, we identified three loans with an aggregate gross book value of $24.7 million for impairment, against which we have recorded a $22.7 million provision, and which are carried at an aggregate net book value of $2.0 million. See Note 5 for a description of our loan impairment and valuation process.

[5] Rates for floating rate loans are based on LIBOR of 0.21% as of December 31, 2012.

[6] P & I = principal and interest. I/O = interest only.