Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Common Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Distributions in Excess of Net Income [Member]	Total
Balance at Dec. 31, 2016		$ 4,453,205	$ 4,589	$ (940,730)	$ 3,517,064
Balance (in Shares) at Dec. 31, 2016		222,939
Share based compensation, net		$ 2,178			2,178
Share based compensation, net (in Shares)		115
Issuance of common shares, net		$ 132,805			132,805
Issuance of common shares, net (in Shares)		6,908
Interest rate derivatives			5,189		5,189
Net income				182,492	182,492
Distributions declared to shareholders				(268,643)	(268,643)
Balance at Dec. 31, 2017		$ 4,588,188	9,778	(1,026,881)	3,571,085
Balance (in Shares) at Dec. 31, 2017		229,962
Share based compensation, net		$ 6,512			6,512
Share based compensation, net (in Shares)	[1]	362
Issuance of common shares, net		$ 4,677			4,677
Issuance of common shares, net (in Shares)		243
Common shares repurchased		$ (104,304)			(104,304)
Common shares repurchased (in Shares)		(6,570)
Interest rate derivatives			228		228
Net income				206,086	206,086
Distributions declared to shareholders				(275,274)	(275,274)
Balance at Dec. 31, 2018		$ 4,495,073	10,006	(1,096,069)	3,409,010
Balance (in Shares) at Dec. 31, 2018		223,997
Cumulative effect of the adoption of ASU 2016-02 related to leases				(5,201)	(5,201)
Share based compensation, net		$ 3,025			3,025
Share based compensation, net (in Shares)	[1]	156
Common shares repurchased		$ (4,335)			(4,335)
Common shares repurchased (in Shares)		(290)
Interest rate derivatives			(14,704)		(14,704)
Net income				171,917	171,917
Distributions declared to shareholders				(268,699)	(268,699)
Balance at Dec. 31, 2019		$ 4,493,763	$ (4,698)	$ (1,198,052)	$ 3,291,013
Balance (in Shares) at Dec. 31, 2019		223,863

[1] Number of shares does not include deferred share units issued under the Company’s Non-Employee Director Deferral Program, however, dollar amount includes the value at issuance.