Condensed Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock Class A common stock	Additional paid-in capital	Accumulated distributions in excess of earnings	Accumulated other comprehensive (loss) income	Total shareholders' equity	Noncontrolling interests
Balance (in shares) at Dec. 31, 2018		213,176
Balance at Dec. 31, 2018	$ 1,747,009	$ 213	$ 4,504,702	$ (2,756,802)	$ (1,522)	$ 1,746,591	$ 418
Increase (decrease) in shareholders' equity [roll forward]
Net (loss) income	16,225			16,225		16,225
Other comprehensive (loss) income	(16,973)				(16,973)	(16,973)
Contributions from noncontrolling interests	2,002						2,002
Distributions declared to common shareholders	(106,141)			(106,141)		(106,141)
Issuance of common stock (in shares)		111
Issuance of restricted shares (in shares)		469
Issuance of restricted shares	1	$ 1				1
Stock-based compensation expense, net of forfeitures (in shares)		(16)
Stock-based compensation expense, net of forfeitures	5,672		5,672			5,672
Shares withheld for employee taxes (in shares)		(85)
Shares withheld for employee taxes	(1,037)		(1,037)			(1,037)
Balance (in shares) at Sep. 30, 2019		213,655
Balance at Sep. 30, 2019	1,646,758	$ 214	4,509,337	(2,846,718)	(18,495)	1,644,338	2,420
Balance (in shares) at Jun. 30, 2019		213,662
Balance at Jun. 30, 2019	1,714,621	$ 214	4,507,488	(2,783,183)	(11,343)	1,713,176	1,445
Increase (decrease) in shareholders' equity [roll forward]
Net (loss) income	(28,153)			(28,153)		(28,153)
Other comprehensive (loss) income	(7,152)				(7,152)	(7,152)
Contributions from noncontrolling interests	975						975
Distributions declared to common shareholders	(35,382)			(35,382)		(35,382)
Stock-based compensation expense, net of forfeitures (in shares)		(7)
Stock-based compensation expense, net of forfeitures	1,849		1,849			1,849
Balance (in shares) at Sep. 30, 2019		213,655
Balance at Sep. 30, 2019	1,646,758	$ 214	4,509,337	(2,846,718)	(18,495)	1,644,338	2,420
Balance (in shares) at Dec. 31, 2019		213,600
Balance at Dec. 31, 2019	1,636,073	$ 214	4,510,484	(2,865,933)	(12,288)	1,632,477	3,596
Increase (decrease) in shareholders' equity [roll forward]
Net (loss) income	12,722			12,722		12,722
Other comprehensive (loss) income	(23,764)				(23,764)	(23,764)
Contributions from noncontrolling interests	3,128						3,128
Termination of consolidated joint ventures			2,217			2,217	(2,217)
Distributions declared to common shareholders	(46,177)			(46,177)		(46,177)
Issuance of common stock (in shares)		148
Issuance of restricted shares (in shares)		624
Stock-based compensation expense, net of forfeitures	6,734		6,734			6,734
Shares withheld for employee taxes (in shares)		(119)
Shares withheld for employee taxes	(1,439)		(1,439)			(1,439)
Balance (in shares) at Sep. 30, 2020		214,253
Balance at Sep. 30, 2020	1,587,277	$ 214	4,517,996	(2,899,388)	(36,052)	1,582,770	4,507
Balance (in shares) at Jun. 30, 2020		214,253
Balance at Jun. 30, 2020	1,594,085	$ 214	4,515,716	(2,886,387)	(39,176)	1,590,367	3,718
Increase (decrease) in shareholders' equity [roll forward]
Net (loss) income	(2,288)			(2,288)		(2,288)
Other comprehensive (loss) income	3,124				3,124	3,124
Contributions from noncontrolling interests	789						789
Distributions declared to common shareholders	(10,713)			(10,713)		(10,713)
Stock-based compensation expense, net of forfeitures	2,280		2,280			2,280
Balance (in shares) at Sep. 30, 2020		214,253
Balance at Sep. 30, 2020	$ 1,587,277	$ 214	$ 4,517,996	$ (2,899,388)	$ (36,052)	$ 1,582,770	$ 4,507