Investments in Real Estate Entities (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Assets:
Real estate, net	$ 856,588		$ 856,588		$ 954,493
Other assets	48,248		48,248		49,519
Total assets	904,836		904,836		1,004,012
Liabilities and partners' capital:
Mortgage notes payable and credit facility	623,708		623,708		689,573
Other liabilities	14,230		14,230		16,537
Partners' capital	266,898		266,898		297,902
Total liabilities and partners' capital	904,836		904,836		$ 1,004,012
Combined summary of the operating results of the accounted for using the equity method
Rental and other income	26,789	$ 33,808	55,432	$ 70,763
Operating and other expenses	(9,914)	(12,967)	(21,009)	(27,137)
Gain on sale of communities	0	76,934	29,447	180,256
Interest expense, net	(6,600)	(9,938)	(13,548)	(29,938)
Depreciation expense	(6,795)	(8,707)	(14,122)	(17,947)
Net income	3,480	79,130	36,200	175,997
Loss on extinguishment of debt, net	$ 24,162	2,461	$ 24,162	2,461
Funds
Combined summary of the operating results of the accounted for using the equity method
Loss on extinguishment of debt, net		$ (1,480)		$ (12,321)