Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Numerator for basic and diluted earnings per share - net income (loss) attributable to common stockholders		$ 179,663	$ 325,585	$ 277,466	$ 815,115
Adjustment for net income (loss) attributable to OP units		(473)	(1,716)	(2,699)	(4,470)
Numerator for diluted earnings per share		$ 179,190	$ 323,869	$ 274,767	$ 810,645
Denominator for basic earnings per share - weighted average shares (in shares)		428,031,000	417,027,000	420,955,000	414,822,000
Effect of dilutive securities:
Non-vested restricted shares (in shares)		537,000	542,000	465,000	620,000
Redeemable op units (in shares)		1,396,000	1,396,000	1,396,000	1,396,000
Employee stock purchase program (in shares)		19,000	22,000	19,000	22,000
Dilutive potential common shares (in shares)		1,952,000	1,960,000	1,880,000	2,038,000
Denominator for diluted earnings per share - adjusted weighted average shares (in shares)		429,983,000	418,987,000	422,835,000	416,860,000
Basic earnings per share (in dollars per share)		$ 0.42	$ 0.78	$ 0.66	$ 1.96
Diluted earnings per share (in dollars per share)	[1]	$ 0.42	$ 0.77	$ 0.65	$ 1.94
Forward sales agreement
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)				11,798,154

[1] Includes adjustment to the numerator for income (loss) attributable to OP unitholders.