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
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 60,364	$ 332,671
Allocation to Noncontrolling Interests – Operating Partnership	(2,143)	(11,535)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(682)	(12,530)
Preferred distributions	(773)	(773)
Net income available to Common Shares	56,766	307,833
Numerator for net income per share – diluted	$ 58,909	$ 319,368
Weighted average Common Shares outstanding	372,280	371,582
OP Units	13,050	13,004
Dilutive Securities Options	1,586	2,363
Denominator for net income per share – diluted	386,916	386,949
Net income per share – basic	$ 0.15	$ 0.83
Net income per share – diluted	$ 0.15	$ 0.83