Earnings Per Share and Earnings Per Unit - Computation of Net Income per Share Basic and Net Income per Share Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 447,332	$ 95,365	$ 835,736	$ 699,517
Allocation to Noncontrolling Interests – Operating Partnership	(14,847)	(3,376)	(27,903)	(24,624)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(534)	(703)	(1,957)	(14,113)
Preferred distributions	(773)	(773)	(2,318)	(2,318)
Net income available to Common Shares	431,178	90,513	803,558	658,462
Numerator for net income per share – diluted	$ 446,025	$ 93,889	$ 831,461	$ 683,086
Weighted average Common Shares outstanding	374,308	371,869	373,474	371,749
OP Units	12,019	13,002	12,367	13,010
Dilutive Securities Options	2,047	781	1,801	1,214
Denominator for net income per share – diluted	388,374	385,652	387,642	385,973
Net income per share – basic	$ 1.15	$ 0.24	$ 2.15	$ 1.77
Net income per share – diluted	$ 1.15	$ 0.24	$ 2.14	$ 1.77