Investments in Real Estate Entities (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Assets:
Real estate, net	$ 1,022,056		$ 1,022,056		$ 1,392,833
Other assets	156,345		156,345		57,044
Total assets	1,178,401		1,178,401		1,449,877
Liabilities and partners' capital:
Mortgage notes payable and credit facility	722,339		722,339		947,205
Other liabilities	20,332		20,332		20,471
Partners' capital	435,730		435,730		482,201
Total liabilities and partners' capital	1,178,401		1,178,401		$ 1,449,877
Combined summary of the operating results of the accounted for using the equity method
Rental and other income	33,808	$ 43,395	70,763	$ 88,650
Operating and other expenses	(12,967)	(17,375)	(27,137)	(34,712)
Gain on sale of communities	76,934	0	180,256	32,490
Interest expense, net	(9,938)	(10,334)	(29,938)	(20,811)
Depreciation expense	(8,707)	(11,942)	(17,947)	(23,845)
Net income	$ 79,130	$ 3,744	$ 175,997	$ 41,772