CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders' Equity [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Distributions in Excess of Earnings) [Member]	Noncontrolling Interests [Member]
Beginning balance (in shares) at Dec. 31, 2019			106,016,287
Beginning balance at Dec. 31, 2019	$ 4,570,858	$ 4,293,510	$ 1,060	$ 4,350,917	$ (58,467)	$ 277,348
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,418	39,817			39,817	5,601
Issuance of common stock (in shares)			8,897,110
Issuance of common stock	721,794	721,794	$ 89	721,705
Issuance of share-based compensation awards	1,720	1,720		1,720
Non-cash amortization of share-based compensation (Note 9)	8,653	8,653		8,653
Settlement of restricted stock units for shares of common stock (in shares)			269,972
Settlement of restricted stock units for shares of common stock	0		$ 3	(3)
Repurchase of common stock, stock options and restricted stock units (in shares)			(117,445)
Repurchase of common stock, stock options and restricted stock units	(9,799)	(9,799)	$ (1)	(9,798)
Exchange of common units of the Operating Partnership (in shares)			2,000
Exchange of common units of the Operating Partnership	0	81		81		(81)
Distributions to noncontrolling interests in consolidated property partnerships	(2,617)					(2,617)
Adjustment for noncontrolling interest	0	(6,094)		(6,094)		6,094
Dividends declared per common share and common unit	(58,512)	(57,532)			(57,532)	(980)
Ending balance (in shares) at Mar. 31, 2020			115,067,924
Ending balance at Mar. 31, 2020	5,277,515	4,992,150	$ 1,151	5,067,181	(76,182)	285,365
Beginning balance (in shares) at Dec. 31, 2019			106,016,287
Beginning balance at Dec. 31, 2019	4,570,858	4,293,510	$ 1,060	4,350,917	(58,467)	277,348
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	123,841
Ending balance (in shares) at Sep. 30, 2020			115,247,221
Ending balance at Sep. 30, 2020	5,251,964	4,968,142	$ 1,152	5,089,926	(122,936)	283,822
Beginning balance (in shares) at Mar. 31, 2020			115,067,924
Beginning balance at Mar. 31, 2020	5,277,515	4,992,150	$ 1,151	5,067,181	(76,182)	285,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,352	19,618			19,618	4,734
Issuance of common stock	(45)	(45)		(45)
Issuance of share-based compensation awards	805	805		805
Non-cash amortization of share-based compensation (Note 9)	13,576	13,576		13,576
Settlement of restricted stock units for shares of common stock (in shares)			33,581
Repurchase of common stock, stock options and restricted stock units (in shares)			(11,668)
Repurchase of common stock, stock options and restricted stock units	(735)	(735)		(735)
Exchange of common units of the Operating Partnership (in shares)			86,701
Exchange of common units of the Operating Partnership	0	3,762	$ 1	3,761		(3,762)
Distributions to noncontrolling interests in consolidated property partnerships	(4,281)					(4,281)
Adjustment for noncontrolling interest	0	(181)		(181)		181
Dividends declared per common share and common unit	(57,598)	(56,659)			(56,659)	(939)
Ending balance (in shares) at Jun. 30, 2020			115,176,538
Ending balance at Jun. 30, 2020	5,253,589	4,972,291	$ 1,152	5,084,362	(113,223)	281,298
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,071	49,028			49,028	5,043
Issuance of common stock	(74)	(74)		(74)
Issuance of share-based compensation awards	1,101	1,101		1,101
Non-cash amortization of share-based compensation (Note 9)	7,794	7,794		7,794
Settlement of restricted stock units for shares of common stock (in shares)			126,740
Settlement of restricted stock units for shares of common stock	0		$ 1	(1)
Repurchase of common stock, stock options and restricted stock units (in shares)			(59,069)
Repurchase of common stock, stock options and restricted stock units	(3,353)	(3,353)	$ (1)	(3,352)
Exchange of common units of the Operating Partnership (in shares)			3,012
Exchange of common units of the Operating Partnership	0	129		129		(129)
Distributions to noncontrolling interests in consolidated property partnerships	(1,458)					(1,458)
Adjustment for noncontrolling interest	0	(33)		(33)		33
Dividends declared per common share and common unit	(59,706)	(58,741)			(58,741)	(965)
Ending balance (in shares) at Sep. 30, 2020			115,247,221
Ending balance at Sep. 30, 2020	$ 5,251,964	4,968,142	$ 1,152	5,089,926	(122,936)	283,822
Beginning balance (in shares) at Dec. 31, 2020	116,035,827		116,035,827
Beginning balance at Dec. 31, 2020	$ 5,277,321	5,029,943	$ 1,160	5,131,916	(103,133)	247,378
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	507,411	497,631			497,631	9,780
Issuance of share-based compensation awards	1,950	1,950		1,950
Non-cash amortization of share-based compensation (Note 9)	9,604	9,604		9,604
Settlement of restricted stock units for shares of common stock (in shares)			769,701
Settlement of restricted stock units for shares of common stock	0		$ 8	(8)
Repurchase of common stock, stock options and restricted stock units (in shares)			(355,158)
Repurchase of common stock, stock options and restricted stock units	(21,137)	(21,137)	$ (3)	(21,134)
Distributions to noncontrolling interests in consolidated property partnerships	(11,680)					(11,680)
Adjustment for noncontrolling interest	0	256		256		(256)
Dividends declared per common share and common unit	(60,577)	(60,002)			(60,002)	(575)
Ending balance (in shares) at Mar. 31, 2021			116,450,370
Ending balance at Mar. 31, 2021	$ 5,702,892	5,458,245	$ 1,165	5,122,584	334,496	244,647
Beginning balance (in shares) at Dec. 31, 2020	116,035,827		116,035,827
Beginning balance at Dec. 31, 2020	$ 5,277,321	5,029,943	$ 1,160	5,131,916	(103,133)	247,378
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 603,784
Ending balance (in shares) at Sep. 30, 2021	116,461,683		116,461,683
Ending balance at Sep. 30, 2021	$ 5,690,638	5,444,464	$ 1,165	5,146,049	297,250	246,174
Beginning balance (in shares) at Mar. 31, 2021			116,450,370
Beginning balance at Mar. 31, 2021	5,702,892	5,458,245	$ 1,165	5,122,584	334,496	244,647
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,880	35,839			35,839	7,041
Issuance of share-based compensation awards	645	645		645
Non-cash amortization of share-based compensation (Note 9)	11,193	11,193		11,193
Settlement of restricted stock units for shares of common stock (in shares)			3,840
Distributions to noncontrolling interests in consolidated property partnerships	(4,692)					(4,692)
Adjustment for noncontrolling interest	0	(102)		(102)		102
Dividends declared per common share and common unit	(59,453)	(58,877)			(58,877)	(576)
Ending balance (in shares) at Jun. 30, 2021			116,454,210
Ending balance at Jun. 30, 2021	5,693,465	5,446,943	$ 1,165	5,134,320	311,458	246,522
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	53,493	47,028			47,028	6,465
Issuance of share-based compensation awards	650	650		650
Non-cash amortization of share-based compensation (Note 9)	11,477	11,477		11,477
Settlement of restricted stock units for shares of common stock (in shares)			11,743
Repurchase of common stock, stock options and restricted stock units (in shares)			(4,270)
Repurchase of common stock, stock options and restricted stock units	(282)	(282)	$ 0	(282)
Contributions from noncontrolling interests in consolidated property partnerships	1,591					1,591
Distributions to noncontrolling interests in consolidated property partnerships	(7,922)					(7,922)
Adjustment for noncontrolling interest	0	(116)		(116)		116
Dividends declared per common share and common unit	$ (61,834)	(61,236)			(61,236)	(598)
Ending balance (in shares) at Sep. 30, 2021	116,461,683		116,461,683
Ending balance at Sep. 30, 2021	$ 5,690,638	$ 5,444,464	$ 1,165	$ 5,146,049	$ 297,250	$ 246,174