Earnings Per Share and Earnings Per Unit - Computation of Net Income per Unit Basic and Net Income per Unit Diluted for Operating Partnership (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 232,678	$ 328,040	$ 306,476	$ 388,404
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	$ (944)	$ (741)	$ (1,583)	$ (1,423)
Dilutive Securities Options	1,698	1,964	1,863	1,773
ATM forward sales	1		69
Denominator for net income per share – diluted	389,363	387,820	389,463	387,367
Net income per Unit – basic	$ 0.59	$ 0.84	$ 0.78	$ 1.00
Net income per Unit – diluted	$ 0.59	$ 0.84	$ 0.78	$ 1.00
ERPOP [Member]
Net income	$ 232,678	$ 328,040	$ 306,476	$ 388,404
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(944)	(741)	(1,583)	(1,423)
Allocation to Preference Units	(773)	(772)	(1,545)	(1,545)
Numerator for net income per Unit – basic and diluted	$ 230,961	$ 326,527	$ 303,348	$ 385,436
Denominator for net income per Unit – basic	387,664	385,856	387,531	385,594
Dilutive Securities Options	1,698	1,964	1,863	1,773
ATM forward sales	1	0	69	0
Denominator for net income per share – diluted	389,363	387,820	389,463	387,367
Net income per Unit – basic	$ 0.59	$ 0.84	$ 0.78	$ 1.00
Net income per Unit – diluted	$ 0.59	$ 0.84	$ 0.78	$ 1.00