Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Distributions Greater Than Net Income [Member]
Balance at Dec. 31, 2019	$ 3,291,013	$ 4,493,763	$ (4,698)	$ (1,198,052)
Balance (in Shares) at Dec. 31, 2019		223,863
Share based compensation, net	9,198	$ 9,198
Share based compensation, net (in Shares)		889
Issuance of common shares, net	(337)	$ (337)
Common shares repurchased	$ (14,336)	$ (14,336)
Common shares repurchased (in Shares)	(1,500)	(1,521)
Interest rate derivatives	$ (43,622)		(43,622)
Net income (loss)	(121,960)			(121,960)
Distributions declared to shareholders	(44,952)			(44,952)
Balance at Sep. 30, 2020	3,075,004	$ 4,488,288	(48,320)	(1,364,964)
Balance (in Shares) at Sep. 30, 2020		223,231
Balance at Jun. 30, 2020	3,112,959	$ 4,488,034	(51,059)	(1,324,016)
Balance (in Shares) at Jun. 30, 2020		223,224
Share based compensation, net	591	$ 591
Share based compensation, net (in Shares)		7
Issuance of common shares, net	(337)	$ (337)
Interest rate derivatives	2,739		2,739
Net income (loss)	(40,948)			(40,948)
Balance at Sep. 30, 2020	3,075,004	$ 4,488,288	(48,320)	(1,364,964)
Balance (in Shares) at Sep. 30, 2020		223,231
Balance at Dec. 31, 2020	3,029,347	$ 4,488,419	(42,802)	(1,416,270)
Balance (in Shares) at Dec. 31, 2020		223,212
Share based compensation, net	6,762	$ 6,762
Share based compensation, net (in Shares)		465
Issuance of common shares, net	75,036	$ 75,036
Issuance of common shares, net (in Shares)		4,677
Interest rate derivatives	18,152		18,152
Net income (loss)	5,607			5,607
Distributions declared to shareholders	(6,790)			(6,790)
Balance at Sep. 30, 2021	3,128,114	$ 4,570,217	(24,650)	(1,417,453)
Balance (in Shares) at Sep. 30, 2021		228,354
Balance at Jun. 30, 2021	3,094,323	$ 4,569,332	(28,076)	(1,446,933)
Balance (in Shares) at Jun. 30, 2021		228,341
Share based compensation, net	915	$ 915
Share based compensation, net (in Shares)		13
Issuance of common shares, net	(30)	$ (30)
Interest rate derivatives	3,426		3,426
Net income (loss)	31,759			31,759
Distributions declared to shareholders	(2,279)			(2,279)
Balance at Sep. 30, 2021	$ 3,128,114	$ 4,570,217	$ (24,650)	$ (1,417,453)
Balance (in Shares) at Sep. 30, 2021		228,354