Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Percentage of physical occupancy									95.00%
Anniversary of Completion of Development or Redevelopment (in years)									1 year
Reconciliation of NOI to net income
Net income	$ 167,671	$ 279,709	$ 168,305	$ 170,418	$ 385,636	$ 192,407	$ 254,543	$ 141,590	$ 786,103	$ 974,175	$ 876,660
Indirect operating expenses, net of corporate income									83,008	80,227	68,312
Other Nonoperating Expense									4,991	3,265	2,736
Interest expense, net									203,585	220,974	199,661
Loss on extinguishment of debt, net									602	17,492	25,472
General and administrative expense									58,042	60,369	53,695
Equity in income of unconsolidated real estate entities									(8,652)	(15,270)	(70,744)
Depreciation expense									661,578	631,196	584,150
Income Tax Expense (Benefit)									13,003	(160)	141
Casualty and impairment loss, net									0	215	6,250
Gain on sale of communities									(166,105)	(374,976)	(252,599)
(Loss) gain on other real estate transactions									(439)	(345)	10,907
Other Selling, General and Administrative Expense									3,812	1,044	0
Net operating income from real estate assets sold or held for sale									(12,318)	(79,372)	(105,663)
Net operating income									$ 1,627,210	$ 1,518,834	$ 1,398,978