Investments in Real Estate Entities (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Combined summary of the operating results of the accounted for using the equity method
Rental and other income	$ 144,431	$ 92,533	$ 102,261
Operating and other expenses	(55,732)	(35,840)	(40,341)
Gain on sale of communities	21,748	54,202	136,333
Interest expense, net	(33,896)	(22,500)	(27,122)
Depreciation expense	(58,387)	(26,706)	(25,914)
Net income	18,164	61,689	145,217
Schedule of Equity Method Investments [Line Items]
Company's share of net income	10,779	17,519	73,120
Amortization of excess investment and other	(2,127)	(2,249)	(2,376)
Equity in income from unconsolidated real estate investments	8,652	$ 15,270	$ 70,744
Avalon Marina Bay [Member] | Notes Payable Maturities 2020 | Secured notes
Schedule of Equity Method Investments [Line Items]
Repayments of secured debt	$ 49,800