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
Common Stock, Dividends, Per Share, Declared	$ 0.50
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		4,636
Dividend reinvestment plan (DRIP), value	51,329	$ 45	51,284			51,329
Share repurchases, shares		(2,806)
Share repurchases, value	(30,884)	$ (28)	(30,856)			(30,884)
Change in unrealized value on interest rate swaps	(47,737)			(41,338)		(41,338)	(6,399)
Common distributions declared	(144,082)				(144,082)	(144,082)
Distributions to noncontrolling interests	(21,206)						(21,206)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		65
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture		$ 1
Share-based compensation expense	5,763		1,358			1,359	4,404
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	(77,687)				(67,642)	(67,642)	(10,045)
Balance, shares at Sep. 30, 2019		283,586
Balance, value at Sep. 30, 2019	$ 2,147,865	$ 2,835	2,717,537	(28,976)	(904,297)	1,787,099	360,766
Common Stock, Dividends, Per Share, Declared	$ 0.17
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividend reinvestment plan (DRIP), shares		1,475
Dividend reinvestment plan (DRIP), value	16,371	$ 14	16,357			16,371
Share repurchases, shares		(1,660)
Share repurchases, value	(18,210)	$ (17)	(18,193)			(18,210)
Change in unrealized value on interest rate swaps	(9,731)			(8,438)		(8,438)	(1,293)
Common distributions declared	(48,062)				(48,062)	(48,062)
Distributions to noncontrolling interests	(6,978)						(6,978)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		1
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture		$ 0
Share-based compensation expense	2,176		502			502	1,674
Net loss	(29,727)				(25,877)	(25,877)	(3,850)
Balance, shares at Sep. 30, 2019		283,586
Balance, value at Sep. 30, 2019	$ 2,147,865	$ 2,835	2,717,537	(28,976)	(904,297)	1,787,099	360,766
Common Stock, Dividends, Per Share, Declared	$ 0.17
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	(40,013)			(34,868)		(34,868)	(5,145)
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		109
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture		$ 2
Share-based compensation expense	3,846		2,508			2,510	1,336
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	(516)	$ (6)	(71)		(438)	(509)	(7)
Net loss	18,216				15,965	15,965	2,251
Balance, shares at Sep. 30, 2020		290,466
Balance, value at Sep. 30, 2020	2,107,653	$ 2,905	2,796,655	(55,630)	(980,534)	1,763,396	344,257
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in unrealized value on interest rate swaps	5,098			4,445		4,445	653
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		1
Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture		$ 0
Share-based compensation expense	1,854		1,036			1,036	818
Other	(198)	$ 0	185		(379)	(194)	(4)
Net loss	13,430				11,784	11,784	1,646
Balance, shares at Sep. 30, 2020		290,466
Balance, value at Sep. 30, 2020	$ 2,107,653	$ 2,905	$ 2,796,655	$ (55,630)	$ (980,534)	$ 1,763,396	$ 344,257