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	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 income (loss)	44,378			44,378		44,378
Other comprehensive (loss) income	(9,821)				(9,821)	(9,821)
Contributions from noncontrolling interests	1,027						1,027
Distributions declared to common shareholders	(70,759)			(70,759)		(70,759)
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)		(9)
Stock-based compensation expense, net of forfeitures	3,823		3,823			3,823
Shares withheld for employee taxes (in shares)		(85)
Shares withheld for employee taxes	(1,037)		(1,037)			(1,037)
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
Balance (in shares) at Mar. 31, 2019		213,585
Balance at Mar. 31, 2019	1,732,620	$ 214	4,505,631	(2,768,965)	(5,036)	1,731,844	776
Increase (decrease) in shareholders' equity [roll forward]
Net income (loss)	21,170			21,170		21,170
Other comprehensive (loss) income	(6,307)				(6,307)	(6,307)
Contributions from noncontrolling interests	669						669
Distributions declared to common shareholders	(35,388)			(35,388)		(35,388)
Issuance of restricted shares (in shares)		77
Stock-based compensation expense, net of forfeitures	1,857		1,857			1,857
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
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 income (loss)	15,010			15,010		15,010
Other comprehensive (loss) income	(26,888)				(26,888)	(26,888)
Contributions from noncontrolling interests	2,339						2,339
Termination of consolidated joint ventures			2,217			2,217	(2,217)
Distributions declared to common shareholders	(35,464)			(35,464)		(35,464)
Issuance of common stock (in shares)		148
Issuance of restricted shares (in shares)		624
Stock-based compensation expense, net of forfeitures (in shares)		0
Stock-based compensation expense, net of forfeitures	4,454		4,454			4,454
Shares withheld for employee taxes (in shares)		(119)
Shares withheld for employee taxes	(1,439)		(1,439)			(1,439)
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
Balance (in shares) at Mar. 31, 2020		214,122
Balance at Mar. 31, 2020	1,597,301	$ 214	4,512,939	(2,879,040)	(39,870)	1,594,243	3,058
Increase (decrease) in shareholders' equity [roll forward]
Net income (loss)	(7,347)			(7,347)		(7,347)
Other comprehensive (loss) income	694				694	694
Contributions from noncontrolling interests	1,216						1,216
Termination of consolidated joint ventures			556			556	(556)
Issuance of restricted shares (in shares)		131
Stock-based compensation expense, net of forfeitures	2,221		2,221			2,221
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