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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 1,396,714	$ 962,501	$ 1,009,708
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	$ (17,964)	$ (14,855)	$ (3,297)
Dilutive Securities Options	1,924	1,080	2,965
ATM forward sales	69
Denominator for net income per share – diluted	388,089	385,874	386,333
Net income per Unit – basic	$ 3.56	$ 2.45	$ 2.61
Net income per Unit – diluted	$ 3.54	$ 2.45	$ 2.60
ERPOP [Member]
Net income	$ 1,396,714	$ 962,501	$ 1,009,708
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(17,964)	(14,855)	(3,297)
Allocation to Preference Units	(3,090)	(3,090)	(3,090)
Numerator for net income per Unit – basic and diluted	$ 1,375,660	$ 944,556	$ 1,003,321
Denominator for net income per Unit – basic	386,096	384,794	383,368
Dilutive Securities Options	1,924	1,080	2,965
ATM forward sales	69
Denominator for net income per share – diluted	388,089	385,874	386,333
Net income per Unit – basic	$ 3.56	$ 2.45	$ 2.61
Net income per Unit – diluted	$ 3.54	$ 2.45	$ 2.60