CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)	Total	Preferred Shares	Common Shares	Additional Paid-in-Capital	Accumulated Distributions in Excess of Net Income	Accumulated Other Comprehensive Income/(Loss)	Noncontrolling Interests
Beginning balance at Dec. 31, 2020	$ 1,991,137,000	$ 94,016,000	$ 28,000	$ 3,196,315,000	$ (1,301,726,000)	$ (17,963,000)	$ 20,467,000
Beginning balance (in shares) at Dec. 31, 2020		1,935,400	277,152,450
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of partnership interest in real estate	5,085,000						5,085,000
Redemption of noncontrolling OP units for common (in shares)			90,607
Redemption of noncontrolling OP units for common shares				468,000			(468,000)
Issuance of common shares and deferred compensation amortization, net	2,942,000			2,942,000
Issuance of common shares and deferred compensation amortization, net (in shares)			926,947
Repurchase of common shares to settle tax obligations	(5,120,000)			(5,120,000)
Repurchase of common shares to settle tax obligations (in shares)			(499,638)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			(10,264)
Forfeiture of employee common shares	2,000				2,000
Dividends/distributions	(63,861,000)				(62,731,000)		(1,130,000)
Net income	115,262,000				113,720,000		1,542,000
Other comprehensive income	5,922,000					5,922,000
Reallocation of noncontrolling interests				435,000			(435,000)
Ending balance at Jun. 30, 2021	2,051,369,000	$ 94,016,000	$ 28,000	3,195,040,000	(1,250,735,000)	(12,041,000)	25,061,000
Ending balance (in shares) at Jun. 30, 2021		1,935,400	277,660,102
Beginning balance at Mar. 31, 2021	2,005,326,000	$ 94,016,000	$ 28,000	3,193,023,000	(1,292,051,000)	(12,617,000)	22,927,000
Beginning balance (in shares) at Mar. 31, 2021		1,935,400	277,614,856
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of partnership interest in real estate	2,373,000						2,373,000
Redemption of noncontrolling OP units for common (in shares)			30,491
Redemption of noncontrolling OP units for common shares				157,000			(157,000)
Issuance of common shares and deferred compensation amortization, net	1,425,000			1,425,000
Issuance of common shares and deferred compensation amortization, net (in shares)			15,745
Forfeiture of employee common shares (in shares)			(990)
Dividends/distributions	(32,118,000)				(31,362,000)		(756,000)
Net income	73,787,000				72,678,000		1,109,000
Other comprehensive income	576,000					576,000
Reallocation of noncontrolling interests				435,000			(435,000)
Ending balance at Jun. 30, 2021	2,051,369,000	$ 94,016,000	$ 28,000	3,195,040,000	(1,250,735,000)	(12,041,000)	25,061,000
Ending balance (in shares) at Jun. 30, 2021		1,935,400	277,660,102
Beginning balance at Dec. 31, 2021	2,323,228,000	$ 94,016,000	$ 28,000	3,252,506,000	(1,049,434,000)	(6,258,000)	32,370,000
Beginning balance (in shares) at Dec. 31, 2021		1,935,400	283,752,726
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of partnership interest in real estate	5,781,000						5,781,000
Redemption of noncontrolling OP units for common (in shares)			20,232
Redemption of noncontrolling OP units for common shares				109,000			(109,000)
Purchase of noncontrolling interest in consolidated joint venture	(27,958,000)			(25,058,000)			(2,900,000)
Issuance of common shares and deferred compensation amortization, net	42,159,000		$ 1,000	42,158,000
Issuance of common shares and deferred compensation amortization, net (in shares)			4,535,376
Stock Repurchased During Period, Value	(73,718,000)		$ (1,000)	(73,717,000)
Stock repurchased during period (in shares)			(6,098,026)
Repurchase of common shares to settle tax obligations	(6,285,000)			(6,285,000)
Repurchase of common shares to settle tax obligations (in shares)			(410,958)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			(128,913)
Forfeiture of employee common shares	8,000				8,000
Dividends/distributions	(71,827,000)				(70,902,000)		(925,000)
Net income	52,446,000				51,920,000		526,000
Other comprehensive income	15,816,000					15,816,000
Ending balance at Jun. 30, 2022	2,259,650,000	$ 94,016,000	$ 28,000	3,189,713,000	(1,068,408,000)	9,558,000	34,743,000
Ending balance (in shares) at Jun. 30, 2022		1,935,400	281,670,437
Beginning balance at Mar. 31, 2022	2,320,482,000	$ 94,016,000	$ 29,000	3,261,770,000	(1,074,998,000)	6,008,000	33,657,000
Beginning balance (in shares) at Mar. 31, 2022		1,935,400	287,871,649
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of partnership interest in real estate	1,672,000						1,672,000
Redemption of noncontrolling OP units for common (in shares)			13,524
Redemption of noncontrolling OP units for common shares				73,000			(73,000)
Issuance of common shares and deferred compensation amortization, net	1,587,000			1,587,000
Issuance of common shares and deferred compensation amortization, net (in shares)			12,203
Stock Repurchased During Period, Value	(73,718,000)		$ (1,000)	73,717,000
Stock repurchased during period (in shares)			(6,098,026)
Forfeiture of employee common shares	8,000				8,000
Forfeiture of employee common shares (in shares)			(128,913)
Dividends/distributions	(35,469,000)				(34,716,000)		(753,000)
Net income	41,538,000				41,298,000		240,000
Other comprehensive income	3,550,000					3,550,000
Ending balance at Jun. 30, 2022	$ 2,259,650,000	$ 94,016,000	$ 28,000	$ 3,189,713,000	$ (1,068,408,000)	$ 9,558,000	$ 34,743,000
Ending balance (in shares) at Jun. 30, 2022		1,935,400	281,670,437