CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders' Equity	Common Stock [Member]	Additional Paid-in Capital [Member]	Distributions in Excess of Earnings [Member]	Noncontrolling Interests [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Total Stockholders' Equity	Cumulative Effect, Period of Adoption, Adjustment [Member] Distributions in Excess of Earnings [Member]
Beginning balance at Dec. 31, 2017	$ 3,960,316	$ 3,700,793	$ 986	$ 3,822,492	$ (122,685)	$ 259,523
Beginning balance (in shares) at Dec. 31, 2017			98,620,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	277,926	258,415			258,415	19,511
Issuance of common stock	130,693	130,693	$ 18	130,675
Issuance of common stock (in shares)			1,817,195
Issuance of share-based compensation awards	3,926	3,926		3,926
Non-cash amortization of share-based compensation	35,890	35,890		35,890
Exercise of stock options	41	41	$ 0	41
Exercise of stock options (in shares)			1,000
Settlement of restricted stock units for shares of common stock	$ 0		$ 4	(4)
Repurchase and cancellation of common stock, stock options and restricted stock (in shares)	0
Repurchase of common stock, stock options and restricted stock units	$ (16,553)	(16,553)	$ (2)	(16,551)
Repurchase of common stock, stock options and restricted stock units (in shares)			(231,800)
Settlement of restricted stock units for shares of common stock (in shares)			488,354
Exchange of common units of the Operating Partnership	0	1,962	$ 1	1,961		(1,962)
Exchange of common units of the Operating Partnership (in shares)			51,906
Contributions from noncontrolling interests in consolidated property partnerships	8,273					8,273
Distributions to noncontrolling interests in consolidated property partnerships	(11,803)					(11,803)
Adjustment for noncontrolling interest in the Operating Partnership	0	(1,477)		(1,477)		1,477
Dividends declared per share of common stock and common unit	(187,448)	(183,783)			(183,783)	(3,665)
Ending balance at Dec. 31, 2018	$ 4,201,261	3,929,907	$ 1,007	3,976,953	(48,053)	271,354	$ (3,146)	$ (3,146)	$ (3,146)
Ending balance (in shares) at Dec. 31, 2018			100,746,988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Net income	$ 215,229	195,443			195,443	19,786
Issuance of common stock	353,722	353,722	$ 50	353,672
Issuance of common stock (in shares)			5,000,000
Issuance of share-based compensation awards	4,664	4,664		4,664
Non-cash amortization of share-based compensation	32,813	32,813		32,813
Exercise of stock options	703	703		703
Exercise of stock options (in shares)			16,500
Settlement of restricted stock units for shares of common stock	$ 0		$ 5	(5)
Repurchase and cancellation of common stock, stock options and restricted stock (in shares)	0		(212,477)
Repurchase and cancellation of common stock, stock options and restricted stock units			$ (2)	(14,859)
Repurchase of common stock, stock options and restricted stock units	$ (14,861)	(14,861)
Settlement of restricted stock units for shares of common stock (in shares)			463,276
Exchange of common units of the Operating Partnership	0	78	$ 0	78		(78)
Exchange of common units of the Operating Partnership (in shares)			2,000
Distributions to noncontrolling interests in consolidated property partnerships	(12,952)					(12,952)
Adjustment for noncontrolling interest in the Operating Partnership	0	(3,102)		(3,102)		3,102
Dividends declared per share of common stock and common unit	(206,575)	(202,711)			(202,711)	(3,864)
Ending balance at Dec. 31, 2019	$ 4,570,858	4,293,510	$ 1,060	4,350,917	(58,467)	277,348
Ending balance (in shares) at Dec. 31, 2019	106,016,287		106,016,287
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 207,293	187,105			187,105	20,188
Issuance of common stock	721,665	721,665	$ 89	721,576
Issuance of common stock (in shares)			8,897,110
Issuance of share-based compensation awards	4,441	4,441		4,441
Non-cash amortization of share-based compensation	37,624	37,624		37,624
Settlement of restricted stock units for shares of common stock	$ 0		$ 4	(4)
Repurchase and cancellation of common stock, stock options and restricted stock (in shares)	0		(191,699)
Repurchase and cancellation of common stock, stock options and restricted stock units			$ (2)	(14,080)
Repurchase of common stock, stock options and restricted stock units	$ (14,082)	(14,082)
Settlement of restricted stock units for shares of common stock (in shares)			441,416
Exchange of common units of the Operating Partnership	0	37,640	$ 9	37,631		(37,640)
Exchange of common units of the Operating Partnership (in shares)			872,713
Distributions to noncontrolling interests in consolidated property partnerships	(15,247)					(15,247)
Adjustment for noncontrolling interest in the Operating Partnership	0	(6,189)		(6,189)		6,189
Dividends declared per share of common stock and common unit	(235,231)	(231,771)			(231,771)	(3,460)
Ending balance at Dec. 31, 2020	$ 5,277,321	$ 5,029,943	$ 1,160	$ 5,131,916	$ (103,133)	$ 247,378
Ending balance (in shares) at Dec. 31, 2020	116,035,827		116,035,827