Investments in Real Estate Entities (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Combined summary of the operating results of the accounted for using the equity method
Rental and other income	$ 92,504	$ 101,615	$ 131,901
Operating and other expenses	(35,005)	(38,566)	(50,945)
Gain on sale of communities	54,202	136,333	196,749
Interest expense, net	(22,488)	(27,104)	(45,886)
Depreciation expense	(26,706)	(25,914)	(34,471)
Net income	62,507	146,364	197,348
Schedule of Equity Method Investments [Line Items]
Loss on extinguishment of debt, net	17,492	25,472	7,075
Funds [Member]
Schedule of Equity Method Investments [Line Items]
Loss on extinguishment of debt, net	$ 312	$ 1,591	$ 12,659