Business and Organization (Details Textual) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Mar. 15, 2013	Jun. 30, 2013 sqft	Jun. 30, 2012	Jun. 30, 2013 sqft	Jun. 30, 2012	Dec. 31, 2012
Proceeds From Sale Of Repurchased Notes				$ 34,381,000
Net gains from disposals	389,140,000	0	53,000	389,140,000	11,996,000
Servicing advances receivable		14,604,000		14,604,000		0
Retained CDO bonds		7,645,000		7,645,000		0
Collateralized Debt Obligations Accrued Interest				3.25%
Disposal Group Cash Proceeds On Disposal After Expenses	6,291,000
Percentage of occupancy for leased office and industrial property		96.00%		96.00%
Number of Properties acquired		20		14
Area Of Land		1,600,000		1,600,000
Business Acquistion Purcahse price allocation				158,220,000
Business acquisition cost of acquired purchase price		111,200,000		111,200,000
Eleven Properties [Member]
Number of Properties acquired		11
Area Of Land		650,000		650,000
Commercial Lease Properties [Member]
Available For Sale Securities and Other Investments		$ 1,500,000		$ 1,500,000