CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Distributions in Excess of Earnings [Member]	Total Stockholders' Equity [Member]	Noncontrolling Interests [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Distributions in Excess of Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Total Stockholders' Equity [Member]
Beginning balance (in shares) at Dec. 31, 2018		100,746,988
Beginning balance at Dec. 31, 2018	$ 4,201,261	$ 1,007	$ 3,976,953	$ (48,053)	$ 3,929,907	$ 271,354	$ (3,146)	$ (3,146)	$ (3,146)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41,794			36,903	36,903	4,891
Issuance of share-based compensation awards	2,210		2,210		2,210
Non-cash amortization of share-based compensation (Note 7)	8,817		8,817		8,817
Settlement of restricted stock units for shares of common stock (in shares)		393,240
Settlement of restricted stock units for shares of common stock	0	$ 4	(4)
Repurchase of common stock, stock options and restricted stock units (in shares)		(175,204)
Repurchase of common stock, stock options and restricted stock units	(12,130)	$ (1)	(12,129)		(12,130)
Exchange of common units of the Operating Partnership (in shares)		2,000
Exchange of common units of the Operating Partnership	0		78		78	(78)
Distributions to noncontrolling interests in consolidated property partnerships	(6,309)					(6,309)
Adjustment for noncontrolling interest	0		279		279	(279)
Dividends declared per common share and common unit	(49,315)			(48,394)	(48,394)	(921)
Ending balance (in shares) at Mar. 31, 2019		100,967,024
Ending balance at Mar. 31, 2019	4,183,182	$ 1,010	3,976,204	(62,690)	3,914,524	268,658
Beginning balance (in shares) at Dec. 31, 2018		100,746,988
Beginning balance at Dec. 31, 2018	4,201,261	$ 1,007	3,976,953	(48,053)	3,929,907	271,354	$ (3,146)	$ (3,146)	$ (3,146)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	89,009
Ending balance (in shares) at Jun. 30, 2019		100,972,035
Ending balance at Jun. 30, 2019	4,186,903	$ 1,010	3,984,867	(70,345)	3,915,532	271,371
Beginning balance (in shares) at Mar. 31, 2019		100,967,024
Beginning balance at Mar. 31, 2019	4,183,182	$ 1,010	3,976,204	(62,690)	3,914,524	268,658
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	47,215			42,194	42,194	5,021
Issuance of share-based compensation awards	820		820		820
Non-cash amortization of share-based compensation (Note 7)	8,732		8,732		8,732
Exercise of stock options (in shares)		1,500
Exercise of stock options	64		64		64
Settlement of restricted stock units for shares of common stock (in shares)		16,270
Settlement of restricted stock units for shares of common stock	0
Repurchase of common stock, stock options and restricted stock units (in shares)		(12,759)
Repurchase of common stock, stock options and restricted stock units	(793)		(793)		(793)
Distributions to noncontrolling interests in consolidated property partnerships	(1,487)					(1,487)
Adjustment for noncontrolling interest	0		(160)		(160)	160
Dividends declared per common share and common unit	(50,830)			(49,849)	(49,849)	(981)
Ending balance (in shares) at Jun. 30, 2019		100,972,035
Ending balance at Jun. 30, 2019	$ 4,186,903	$ 1,010	3,984,867	(70,345)	3,915,532	271,371
Beginning balance (in shares) at Dec. 31, 2019	106,016,287	106,016,287
Beginning balance at Dec. 31, 2019	$ 4,570,858	$ 1,060	4,350,917	(58,467)	4,293,510	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 (Note 4)	721,794	$ 89	721,705		721,794
Issuance of share-based compensation awards	1,720		1,720		1,720
Non-cash amortization of share-based compensation (Note 7)	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)	$ (1)	(9,798)		(9,799)
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	$ 1,151	5,067,181	(76,182)	4,992,150	285,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning balance (in shares) at Dec. 31, 2019	106,016,287	106,016,287
Beginning balance at Dec. 31, 2019	$ 4,570,858	$ 1,060	4,350,917	(58,467)	4,293,510	277,348
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 69,770
Ending balance (in shares) at Jun. 30, 2020	115,176,538	115,176,538
Ending balance at Jun. 30, 2020	$ 5,253,589	$ 1,152	5,084,362	(113,223)	4,972,291	281,298
Beginning balance (in shares) at Mar. 31, 2020		115,067,924
Beginning balance at Mar. 31, 2020	5,277,515	$ 1,151	5,067,181	(76,182)	4,992,150	285,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,352			19,618	19,618	4,734
Issuance of common stock (in shares)		0
Issuance of common stock (Note 4)	(45)	$ 0	(45)		(45)
Issuance of share-based compensation awards	805		805		805
Non-cash amortization of share-based compensation (Note 7)	13,576		13,576		13,576
Settlement of restricted stock units for shares of common stock (in shares)		33,581
Settlement of restricted stock units for shares of common stock	0	$ 0	0
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)	$ 0	(735)		(735)
Exchange of common units of the Operating Partnership (in shares)		86,701
Exchange of common units of the Operating Partnership	0	$ 1	3,761		3,762	(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	115,176,538
Ending balance at Jun. 30, 2020	$ 5,253,589	$ 1,152	$ 5,084,362	$ (113,223)	$ 4,972,291	$ 281,298