Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Numerator for basic and diluted earnings per share - net income (loss) attributable to common stockholders		$ 71,546	$ 310,284
Adjustment for net income (loss) attributable to OP units		(1,353)	(1,388)
Numerator for diluted earnings per share		$ 70,193	$ 308,896
Denominator for basic earnings per share - weighted average shares (in shares)		417,241,000	410,306,000
Effect of dilutive securities:
Non-vested restricted shares (in shares)		421,000	702,000
Redeemable op units (in shares)		1,396,000	1,396,000
Employee stock purchase program (in shares)		21,000	16,000
Dilutive potential common shares (in shares)		1,838,000	2,114,000
Denominator for diluted earnings per share - adjusted weighted average shares (in shares)		419,079,000	412,420,000
Basic earnings per share (in dollars per share)		$ 0.17	$ 0.76
Diluted earnings per share (in dollars per share)	[1]	$ 0.17	$ 0.75
Forward sales agreement
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)		2,214,760

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