Investments in Real Estate Entities (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Assets:
Real estate, net	$ 862,612		$ 954,493
Other assets	76,208		49,519
Total assets	938,820		1,004,012
Liabilities and partners' capital:
Mortgage notes payable and credit facility	625,256		689,573
Other liabilities	15,861		16,537
Partners' capital	297,703		297,902
Total liabilities and partners' capital	938,820		$ 1,004,012
Combined summary of the operating results of the accounted for using the equity method
Rental and other income	28,642	$ 36,955
Operating and other expenses	(11,094)	(14,170)
Gain on sale of communities	29,447	103,321
Interest expense, net	(6,948)	(20,001)
Depreciation expense	(7,327)	(9,240)
Net income	$ 32,720	96,865
Funds [Member]
Combined summary of the operating results of the accounted for using the equity method
Gains (losses) on extinguishment of debt		$ 10,864