Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	AOCI	Accumulated Deficit	Total Stockholders' Equity	Noncontrolling Interests
Balance, shares at Dec. 31, 2018		279,803
Balance, value at Dec. 31, 2018	$ 2,412,369	$ 2,798	$ 2,674,871	$ 12,362	$ (692,573)	$ 1,997,458	$ 414,911
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend reinvestment plan (DRIP), shares		3,161
Dividend reinvestment plan (DRIP), value	34,958	$ 31	34,927			34,958
Share repurchases, shares		(1,146)
Share repurchases, value	(12,674)	$ (11)	(12,663)			(12,674)
Change in unrealized value on interest rate swaps	(38,006)			(32,900)		(32,900)	(5,106)
Common distributions declared	(96,020)				(96,020)	(96,020)
Distributions to noncontrolling interests	(14,228)						(14,228)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		64
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture		$ 1
Share-based compensation expense	3,587		856			857	2,730
Conversion of noncontrolling interests, shares		1,888
Conversion of noncontrolling interests, value		$ 19	20,880			20,899
Stock Issued During Period, Shares, Conversion of Convertible Securities							(20,899)
Net loss	(47,960)				(41,765)	(41,765)	(6,195)
Balance, shares at Jun. 30, 2019		283,770
Balance, value at Jun. 30, 2019	2,242,026	$ 2,838	2,718,871	(20,538)	(830,358)	1,870,813	371,213
Balance, shares at Mar. 31, 2019		281,549
Balance, value at Mar. 31, 2019	2,349,185	$ 2,815	2,693,946	(61)	(745,740)	1,950,960	398,225
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend reinvestment plan (DRIP), shares		1,558
Dividend reinvestment plan (DRIP), value	17,240	$ 15	17,225			17,240
Share repurchases, shares		(541)
Share repurchases, value	(5,994)	$ (5)	(5,989)			(5,994)
Change in unrealized value on interest rate swaps	(23,645)			(20,477)		(20,477)	(3,168)
Common distributions declared	(48,048)				(48,048)	(48,048)
Distributions to noncontrolling interests	(7,061)						(7,061)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		24
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture		$ 1
Share-based compensation expense	2,521		629			630	1,891
Conversion of noncontrolling interests, shares		1,180
Conversion of noncontrolling interests, value		$ 12	13,060			13,072
Stock Issued During Period, Shares, Conversion of Convertible Securities							(13,072)
Net loss	(42,172)				(36,570)	(36,570)	(5,602)
Balance, shares at Jun. 30, 2019		283,770
Balance, value at Jun. 30, 2019	$ 2,242,026	$ 2,838	2,718,871	(20,538)	(830,358)	1,870,813	371,213
Common Stock, Dividends, Per Share, Declared	$ 0.34
Balance, shares at Dec. 31, 2019		289,047
Balance, value at Dec. 31, 2019	$ 2,168,794	$ 2,890	2,779,130	(20,762)	(947,252)	1,814,006	354,788
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend reinvestment plan (DRIP), shares		1,436
Dividend reinvestment plan (DRIP), value	15,940	$ 14	15,926			15,940
Share repurchases, shares		(288)
Share repurchases, value	(2,700)	$ (3)	(2,697)			(2,700)
Change in unrealized value on interest rate swaps	(45,111)			(39,313)		(39,313)	(5,798)
Common distributions declared	(48,809)				(48,809)	(48,809)
Distributions to noncontrolling interests	(7,105)						(7,105)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		108
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture		$ 2
Share-based compensation expense	1,992		1,472			1,474	518
Conversion of noncontrolling interests, shares		168
Conversion of noncontrolling interests, value	0	$ 2	1,859			1,861
Stock Issued During Period, Shares, Conversion of Convertible Securities							(1,861)
Other	(318)	$ (6)	(256)		(59)	(315)	(3)
Net loss	4,786				4,181	4,181	605
Balance, shares at Jun. 30, 2020		290,465
Balance, value at Jun. 30, 2020	$ 2,087,469	$ 2,905	2,795,434	(60,075)	(991,939)	1,746,325	341,144
Common Stock, Dividends, Per Share, Declared	$ 0.17
Balance, shares at Mar. 31, 2020		290,416
Balance, value at Mar. 31, 2020	$ 2,093,806	$ 2,903	2,793,803	(58,552)	(986,292)	1,751,862	341,944
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in unrealized value on interest rate swaps	(1,747)			(1,523)		(1,523)	(224)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		5
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture		$ 1
Share-based compensation expense	2,141		1,332			1,333	808
Conversion of noncontrolling interests, shares		50
Conversion of noncontrolling interests, value		$ 1	555			556
Stock Issued During Period, Shares, Conversion of Convertible Securities							(556)
Other	(318)	$ (6)	(256)		(59)	(315)	(3)
Net loss	(6,413)				(5,588)	(5,588)	(825)
Balance, shares at Jun. 30, 2020		290,465
Balance, value at Jun. 30, 2020	$ 2,087,469	$ 2,905	$ 2,795,434	$ (60,075)	$ (991,939)	$ 1,746,325	$ 341,144