Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Numerator for basic and diluted earnings per share - net income (loss) attributable to common stockholders	$ 310,284	$ 280,470
Adjustment for net income (loss) attributable to OP units	(1,388)	46
Numerator for diluted earnings per share	$ 308,896	$ 280,516
Denominator for basic earnings per share - weighted average shares (in shares)	410,306	391,474
Effect of dilutive securities:
Employee stock options (in shares)	0	1
Non-vested restricted shares (in shares)	702	868
Redeemable shares (in shares)	1,396	1,096
Employee stock purchase program (in shares)	16	13
Dilutive potential common shares (in shares)	2,114	1,978
Denominator for diluted earnings per share - adjusted weighted average shares (in shares)	412,420	393,452
Basic earnings per share (in USD per share)	$ 0.76	$ 0.72
Diluted earnings per share (in USD per share)	$ 0.75	$ 0.71