Transactions with Related Parties Narrative Tagging (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) owners properties	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) owners properties	Sep. 30, 2014 USD ($)
rate for administration fees			0.45%
Fees and Commissions, Other	$ 259,000	$ 397,000	$ 1	$ 1,100,000
Management Fees Revenue	309,000	315,000	952,000	948,000
Placement Advisory Fees	$ 129,000	198,500	$ 507,000	607,000
Number of Variable Interest Entities | properties	13		13
Majority-Owned Subsidiary, Unconsolidated [Member]
Payment for Administrative Fees	$ 669,000	536,000	$ 1,900,000	2
Affiliated Entity [Member]
Payment for Administrative Fees	$ 16,000	$ 17,000	$ 46,000	51,000
Consolidated VIEs [Member]
Number of Variable Interest Entities | properties	2		2
MF Properties [Member]
Number of Real Estate Properties | properties	6		6
UNL Project [Member]
Fees and Commissions			$ 500,000	668,000
Total Owners [Member]
Number of Owners | owners	3		3
Total Owners [Member] | Consolidated VIEs [Member]
Number of Variable Interest Entities | properties	2		2
Mortgage revenue bonds [Member]
Placement Advisory Fees				$ 888,000
Unconsolidated Properties [Member]
Number of Real Estate Properties | properties	9		9
Number of Variable Interest Entities | properties	11		11