CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	PREFERRED SHARES	COMMON SHARES	ACCUMULATED DISTRIBUTIONS IN EXCESS OF NET INCOME	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	NONREDEEMABLE NONCONTROLLING INTERESTS
Beginning Balance at Dec. 31, 2018	$ 643,449	$ 99,456	$ 899,234	$ (429,048)	$ (856)	$ 74,663
Beginning Balance (in shares) at Dec. 31, 2018			11,942
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	31,822			30,011		1,811
Change in fair value of derivatives	(8,937)				(8,937)
Distributions – common shares and units	(27,200)			(24,527)		(2,673)
Distributions – Series C preferred shares	(5,116)			(5,116)
Share-based compensation, net of forfeitures (in shares)			11
Share-based compensation, net of forfeitures	1,452		$ 1,452
Redemption of units for common shares (in shares)			8
Redemption of units for common shares	0		$ (511)			511
Redemption of units for cash	(8,135)					(8,135)
Shares repurchased (in shares)			(329)
Shares repurchased	(18,023)		$ (18,023)
Acquisition of redeemable noncontrolling interests	4,529		$ 4,529
Other (in shares)			(7)
Other	(178)		$ (83)			(95)
Ending Balance (in shares) at Sep. 30, 2019			11,625
Ending Balance at Sep. 30, 2019	613,663	99,456	$ 886,598	(428,680)	(9,793)	66,082
Beginning Balance at Jun. 30, 2019	594,000	99,456	$ 888,541	(450,433)	(7,598)	64,034
Beginning Balance (in shares) at Jun. 30, 2019			11,656
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	34,558			31,596		2,962
Change in fair value of derivatives	(2,195)				(2,195)
Distributions – common shares and units	(8,995)			(8,138)		(857)
Distributions – Series C preferred shares	(1,705)			(1,705)
Share-based compensation, net of forfeitures (in shares)			8
Share-based compensation, net of forfeitures	472		$ 472
Redemption of units for common shares	0		$ 10			(10)
Redemption of units for cash	(11)					(11)
Shares repurchased (in shares)			(39)
Shares repurchased	(2,346)		$ (2,346)
Other	(115)		$ (79)			(36)
Ending Balance (in shares) at Sep. 30, 2019			11,625
Ending Balance at Sep. 30, 2019	613,663	99,456	$ 886,598	(428,680)	(9,793)	66,082
Beginning Balance at Dec. 31, 2019	679,902	99,456	$ 917,400	(390,196)	(7,607)	60,849
Beginning Balance (in shares) at Dec. 31, 2019			12,098
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	8,935			8,819		116
Change in fair value of derivatives	(9,649)				(9,649)
Distributions – common shares and units	(28,735)			(26,576)		(2,159)
Distributions – Series C preferred shares	(4,921)			(4,921)
Share-based compensation, net of forfeitures (in shares)			20
Share-based compensation, net of forfeitures	1,521		$ 1,521
Redemption of units for common shares (in shares)			40
Redemption of units for common shares	0		$ (344)			344
Redemption of units for cash	(48)					(48)
Shares repurchased	(5,629)	(5,926)		297
Acquisition of redeemable noncontrolling interests	(12,221)		$ (7,584)			(4,637)
Other (in shares)			(1)
Other	(848)		$ (761)			(87)
Sale of common shares, net (in shares)			819
Sale of common shares, net	58,204		$ 58,204
Ending Balance (in shares) at Sep. 30, 2020			12,976
Ending Balance at Sep. 30, 2020	686,511	93,530	$ 968,436	(412,577)	(17,256)	54,378
Beginning Balance at Jun. 30, 2020	665,507	93,579	$ 958,292	(421,515)	(18,139)	53,290
Beginning Balance (in shares) at Jun. 30, 2020			12,827
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	21,024			19,629		1,395
Change in fair value of derivatives	883				883
Distributions – common shares and units	(9,796)			(9,083)		(713)
Distributions – Series C preferred shares	(1,607)			(1,607)
Share-based compensation, net of forfeitures	554		$ 554
Redemption of units for common shares (in shares)			4
Redemption of units for common shares	0		$ (462)			462
Redemption of units for cash	(25)					(25)
Shares repurchased	(50)	(49)		(1)
Other	(42)		$ (11)			(31)
Sale of common shares, net (in shares)			145
Sale of common shares, net	10,063		$ 10,063
Ending Balance (in shares) at Sep. 30, 2020			12,976
Ending Balance at Sep. 30, 2020	$ 686,511	$ 93,530	$ 968,436	$ (412,577)	$ (17,256)	$ 54,378