CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders' Equity	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2016			143,985,036
Balance at Dec. 31, 2016	$ 4,427,168	$ 4,105,887	$ 1,440	$ 4,593,229	$ (488,782)	$ 0	$ 321,281
Increase (Decrease) in Stockholders' Equity
Net income	161,673	146,130			146,130		15,543
Interest rate cap/swap agreements	(42)
Interest rate cap/swap agreements	(42)	(42)				(42)
Amortization of share and unit-based plans (in shares)			97,694
Amortization of share and unit-based plans	37,005	37,005	$ 1	37,004
Employee stock purchases (in shares)			38,832
Employee stock purchases	1,868	1,868		1,868
Stock repurchase (in shares)			(3,627,390)
Stock repurchases	(221,428)	(221,428)	$ (36)	(135,176)	(86,216)
Distributions	(407,895)	(407,895)			(407,895)
Distributions to noncontrolling interests	(35,944)						(35,944)
Contributions from noncontrolling interests	30						30
Conversion of noncontrolling interests to common shares (in shares)			499,813
Conversion of noncontrolling interests to common shares	0	16,797	$ 5	16,792			(16,797)
Redemption of noncontrolling interests	(920)	(615)		(615)			(305)
Adjustment of noncontrolling interests in Operating Partnership	0	(2,613)		(2,613)			2,613
Balance (in shares) at Dec. 31, 2017			140,993,985
Balance at Dec. 31, 2017	3,967,999	3,681,578	$ 1,410	4,510,489	(830,279)	(42)	286,421
Increase (Decrease) in Stockholders' Equity
Net income	68,972	60,020			60,020		8,952
Interest rate cap/swap agreements	(4,424)	(4,424)				(4,424)
Amortization of share and unit-based plans (in shares)			125,723
Amortization of share and unit-based plans	33,551	33,551	$ 1	33,550
Employee stock purchases (in shares)			35,293
Employee stock purchases	1,570	1,570		1,570
Distributions	(419,239)	(419,239)			(419,239)
Distributions to noncontrolling interests	(34,395)						(34,395)
Contributions from noncontrolling interests	16						16
Conversion of noncontrolling interests to common shares (in shares)			66,711
Conversion of noncontrolling interests to common shares	0	75	$ 1	74			(75)
Redemption of noncontrolling interests	(759)	(511)		(511)			(248)
Adjustment of noncontrolling interests in Operating Partnership	0	22,471		22,471			(22,471)
Balance (in shares) at Dec. 31, 2018			141,221,712
Balance at Dec. 31, 2018	3,188,432	2,950,232	$ 1,412	4,567,643	(1,614,357)	(4,466)	238,200
Increase (Decrease) in Stockholders' Equity
Net income	102,554	96,820			96,820		5,734
Interest rate cap/swap agreements	(4,585)	(4,585)				(4,585)
Amortization of share and unit-based plans (in shares)			106,747
Amortization of share and unit-based plans	16,723	16,723	$ 1	16,722
Employee stock purchases (in shares)			58,191
Employee stock purchases	1,519	1,519	$ 1	1,518
Distributions	(424,272)	(424,272)			(424,272)
Distributions to noncontrolling interests	(50,262)						(50,262)
Contributions from noncontrolling interests	3,131						3,131
Conversion of noncontrolling interests to common shares (in shares)			21,000
Conversion of noncontrolling interests to common shares	0	1,005		1,005			(1,005)
Redemption of noncontrolling interests	(67)	(31)		(31)			(36)
Adjustment of noncontrolling interests in Operating Partnership	$ 0	(2,946)		(2,946)			2,946
Balance (in shares) at Dec. 31, 2019	141,407,650		141,407,650
Balance at Dec. 31, 2019	$ 2,830,970	$ 2,632,262	$ 1,414	$ 4,583,911	$ (1,944,012)	$ (9,051)	$ 198,708