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)	NONCONTROLLING INTERESTS
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 noncontrolling interests	(12,089)			(10,810)		(1,279)
Change in fair value of derivatives	(10,532)				(10,532)
Distributions - common shares and units	(18,939)			(17,493)		(1,446)
Distributions - Series C preferred shares	(3,314)			(3,314)
Share-based compensation, net of forfeitures (in shares)			19
Share-based compensation, net of forfeitures	967		$ 967
Sale of common shares, net (in shares)			674
Sale of common shares, net	48,141		$ 48,141
Redemption of units for common shares (in shares)			36
Redemption of units for common shares	0		$ 118			(118)
Shares repurchased	(5,579)	(5,877)		298
Acquisition of redeemable noncontrolling interests	(12,221)		(7,584)			(4,637)
Other	(829)		$ (750)			(79)
Ending balance (in shares) at Jun. 30, 2020			12,827
Ending balance at Jun. 30, 2020	665,507	93,579	$ 958,292	(421,515)	(18,139)	53,290
Beginning balance at Mar. 31, 2020	639,716	96,046	$ 912,653	(407,150)	(17,360)	55,527
Beginning balance (in shares) at Mar. 31, 2020			12,163
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and noncontrolling interests	(4,245)			(3,803)		(442)
Change in fair value of derivatives	(779)				(779)
Distributions - common shares and units	(9,693)			(8,978)		(715)
Distributions - Series C preferred shares	(1,609)			(1,609)
Share-based compensation, net of forfeitures (in shares)			18
Share-based compensation, net of forfeitures	502		$ 502
Sale of common shares, net (in shares)			624
Sale of common shares, net	44,789		$ 44,789
Redemption of units for common shares (in shares)			22
Redemption of units for common shares	0		$ 1,048			(1,048)
Shares repurchased	(2,442)	(2,467)		25
Other	(732)		$ (700)			(32)
Ending balance (in shares) at Jun. 30, 2020			12,827
Ending balance at Jun. 30, 2020	665,507	93,579	$ 958,292	(421,515)	(18,139)	53,290
Beginning balance at Dec. 31, 2020	672,823	93,530	$ 968,263	(427,681)	(15,905)	54,616
Beginning balance (in shares) at Dec. 31, 2020			13,027
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and noncontrolling interests	17,624			16,671		953
Change in fair value of derivatives	3,841				3,841
Distributions - common shares and units	(20,368)			(19,086)		(1,282)
Distributions - Series C preferred shares	(3,214)			(3,214)
Share-based compensation, net of forfeitures (in shares)			27
Share-based compensation, net of forfeitures	1,487		$ 1,487
Sale of common shares, net (in shares)			896
Sale of common shares, net	66,356		$ 66,356
Redemption of units for common shares (in shares)			95
Redemption of units for common shares	0		$ 418			(418)
Change in value of Series D preferred units	(1,462)		(1,462)
Other	(1,201)		$ (1,122)			(79)
Ending balance (in shares) at Jun. 30, 2021			14,045
Ending balance at Jun. 30, 2021	735,886	93,530	$ 1,033,940	(433,310)	(12,064)	53,790
Beginning balance at Mar. 31, 2021	671,452	93,530	$ 980,453	(443,409)	(12,798)	53,676
Beginning balance (in shares) at Mar. 31, 2021			13,220
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and noncontrolling interests	22,943			21,538		1,405
Change in fair value of derivatives	734				734
Distributions - common shares and units	(10,449)			(9,832)		(617)
Distributions - Series C preferred shares	(1,607)			(1,607)
Share-based compensation, net of forfeitures (in shares)			24
Share-based compensation, net of forfeitures	678		$ 678
Sale of common shares, net (in shares)			732
Sale of common shares, net	54,574		$ 54,574
Redemption of units for common shares (in shares)			69
Redemption of units for common shares	0		$ 638			(638)
Change in value of Series D preferred units	(1,462)		(1,462)
Other	(977)		$ (941)			(36)
Ending balance (in shares) at Jun. 30, 2021			14,045
Ending balance at Jun. 30, 2021	$ 735,886	$ 93,530	$ 1,033,940	$ (433,310)	$ (12,064)	$ 53,790