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]
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
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	$ 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, 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	115,067,924
Ending balance at Mar. 31, 2020	$ 5,277,515	$ 1,151	$ 5,067,181	$ (76,182)	$ 4,992,150	$ 285,365