Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Numerator for basic and diluted earnings per share - net income (loss) attributable to common stockholders		$ 325,585	$ 589,876	$ 815,115	$ 1,008,108
Adjustment for net income (loss) attributable to OP units		(1,716)	492	(4,470)	580
Numerator for diluted earnings per share		$ 323,869	$ 590,368	$ 810,645	$ 1,008,688
Denominator for basic earnings per share - weighted average shares (in shares)		417,027	405,023	414,822	400,441
Effect of dilutive securities:
Non-vested restricted shares (in shares)		542	757	620	860
Redeemable op units (in shares)		1,396	1,096	1,396	1,096
Employee stock purchase program (in shares)		22	15	22	15
Dilutive potential common shares (in shares)		1,960	1,868	2,038	1,971
Denominator for diluted earnings per share - adjusted weighted average shares (in shares)		418,987	406,891	416,860	402,412
Basic earnings per share (in dollars per share)		$ 0.78	$ 1.46	$ 1.96	$ 2.52
Diluted earnings per share (in dollars per share)	[1]	$ 0.77	$ 1.45	$ 1.94	$ 2.51

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