CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - 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 (in shares) at Dec. 31, 2017			12,004
Beginning Balance at Dec. 31, 2017	$ 714,043	$ 99,456	$ 902,305	$ (374,365)	$ (539)	$ 87,186
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	(12,681)			(10,917)		(1,764)
Change in fair value of derivatives	3,299				3,299
Distributions – common shares and units	(28,078)			(25,129)		(2,949)
Distributions – Series C preferred shares	(5,116)			(5,116)
Shares issued and share-based compensation (in shares)			6
Shares issued and share-based compensation	1,032		$ 1,032
Redemption of units for common shares (in shares)			24
Redemption of units for common shares	0		$ 658			(658)
Redemption of units for cash	(2,751)					(2,751)
Shares repurchased (in shares)			(67)
Shares repurchased	(3,415)		$ (3,415)
Distributions to nonredeemable noncontrolling interests – consolidated real estate entities	(2,428)					(2,428)
Other (in shares)			(6)
Other	(357)		$ (212)			(145)
Ending Balance (in shares) at Sep. 30, 2018			11,961
Ending Balance at Sep. 30, 2018	664,175	99,456	$ 900,368	(414,900)	2,760	76,491
Beginning Balance (in shares) at Jun. 30, 2018			11,939
Beginning Balance at Jun. 30, 2018	672,383	99,456	$ 899,480	(407,482)	1,748	79,181
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	3,617			2,653		964
Change in fair value of derivatives	1,012				1,012
Distributions – common shares and units	(9,338)			(8,366)		(972)
Distributions – Series C preferred shares	(1,705)			(1,705)
Shares issued and share-based compensation (in shares)			1
Shares issued and share-based compensation	421		$ 421
Redemption of units for common shares (in shares)			21
Redemption of units for common shares	0		$ 624			(624)
Redemption of units for cash	(4)					(4)
Distributions to nonredeemable noncontrolling interests – consolidated real estate entities	(2,185)					(2,185)
Other	(26)		$ (157)			131
Ending Balance (in shares) at Sep. 30, 2018			11,961
Ending Balance at Sep. 30, 2018	664,175	99,456	$ 900,368	(414,900)	2,760	76,491
Beginning Balance (in shares) at Dec. 31, 2018			11,942
Beginning Balance at Dec. 31, 2018	643,449	99,456	$ 899,234	(429,048)	(856)	74,663
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)
Shares issued and share-based compensation (in shares)			11
Shares issued and share-based compensation	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 (in shares) at Jun. 30, 2019			11,656
Beginning Balance at Jun. 30, 2019	594,000	99,456	$ 888,541	(450,433)	(7,598)	64,034
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)
Shares issued and share-based compensation (in shares)			8
Shares issued and share-based compensation	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