Summary of Significant Accounting Policies - Schedule of Computation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Net income attributable to common stockholders	$ 481,779	$ 419,967	$ 415,289
Earnings and dividends allocated to participating securities	(706)	(680)	(723)
Earnings for basic computations	481,073	419,287	414,566
Earnings and dividends allocated to participating securities	0	680	723
Income allocated to noncontrolling interest - Preferred Operating Partnership Units and Operating Partnership Units	0	23,727	22,831
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units)	0	(2,288)	(2,288)
Net income for diluted computations	$ 481,073	$ 441,406	$ 435,832
Weighted average common shares outstanding:
Average number of common shares outstanding - basic (in shares)	129,541,531	128,203,568	126,087,487
OP Units (in shares)	0	6,006,114	5,675,547
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Unvested restricted stock awards included for treasury stock method (in shares)	0	212,402	244,215
Shares related to exchangeable senior notes and dilutive stock options (in shares)	43,298	1,136,205	276,304
Average number of common shares outstanding - diluted (in shares)	129,584,829	136,433,769	133,159,033
Earnings per common share
Basic (in dollars per share)	$ 3.71	$ 3.27	$ 3.29
Diluted (in dollars per share)	$ 3.71	$ 3.24	$ 3.27
Series A Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Series A Units (in shares)	0	875,480	875,480