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	NONREDEEMABLE NONCONTROLLING INTERESTS
Beginning Balance at Dec. 31, 2017	$ 714,043	$ 99,456	$ 902,305	$ (374,365)	$ (539)	$ 87,186
Beginning Balance (in shares) at Dec. 31, 2017			12,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	(16,298)			(13,570)		(2,728)
Change in fair value of derivatives	2,287				2,287
Distributions – common shares and units	(18,740)			(16,763)		(1,977)
Distributions – Series C preferred shares	(3,411)			(3,411)
Shares issued and share-based compensation (in shares)			5
Shares issued and share-based compensation	611		$ 611
Redemption of units for common shares (in shares)			3
Redemption of units for common shares	0		$ 34			(34)
Redemption of units for cash	(2,747)					(2,747)
Shares repurchased (in shares)			(67)
Shares repurchased	(3,415)		$ (3,415)
Other (in shares)			(6)
Other	(574)		$ (55)			(519)
Ending Balance at Jun. 30, 2018	672,383	99,456	$ 899,480	(407,482)	1,748	79,181
Ending Balance (in shares) at Jun. 30, 2018			11,939
Beginning Balance at Mar. 31, 2018	708,467	99,456	$ 901,312	(377,871)	1,283	84,287
Beginning Balance (in shares) at Mar. 31, 2018			11,979
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	(23,183)			(20,174)		(3,009)
Change in fair value of derivatives	465				465
Distributions – common shares and units	(9,345)			(8,358)		(987)
Distributions – Series C preferred shares	(1,706)			(1,706)
Shares issued and share-based compensation (in shares)			3
Shares issued and share-based compensation	187		$ 187
Redemption of units for cash	(510)					(510)
Shares repurchased (in shares)			(37)
Shares repurchased	(1,973)		$ (1,973)
Other (in shares)			(6)
Other	(646)		$ (46)			(600)
Ending Balance at Jun. 30, 2018	672,383	99,456	$ 899,480	(407,482)	1,748	79,181
Ending Balance (in shares) at Jun. 30, 2018			11,939
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	(2,736)			(1,585)		(1,151)
Change in fair value of derivatives	(6,742)				(6,742)
Distributions – common shares and units	(18,205)			(16,389)		(1,816)
Distributions – Series C preferred shares	(3,411)			(3,411)
Shares issued and share-based compensation (in shares)			3
Shares issued and share-based compensation	981		$ 981
Redemption of units for common shares (in shares)			8
Redemption of units for common shares	0		$ (521)			521
Redemption of units for cash	(8,124)					(8,124)
Shares repurchased (in shares)			(290)
Shares repurchased	(15,677)		$ (15,677)
Acquisition of redeemable noncontrolling interests	4,529		$ 4,529
Other (in shares)			7
Other	(64)		$ (5)			(59)
Ending Balance at Jun. 30, 2019	594,000	99,456	$ 888,541	(450,433)	(7,598)	64,034
Ending Balance (in shares) at Jun. 30, 2019			11,656
Beginning Balance at Mar. 31, 2019	620,392	99,456	$ 895,381	(443,661)	(3,139)	72,355
Beginning Balance (in shares) at Mar. 31, 2019			11,768
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to controlling interests and nonredeemable noncontrolling interests	3,107			3,113		(6)
Change in fair value of derivatives	(4,459)				(4,459)
Distributions – common shares and units	(9,038)			(8,179)		(859)
Distributions – Series C preferred shares	(1,706)			(1,706)
Shares issued and share-based compensation (in shares)			3
Shares issued and share-based compensation	565		$ 565
Redemption of units for common shares (in shares)			8
Redemption of units for common shares	0		$ (521)			521
Redemption of units for cash	(7,968)					(7,968)
Shares repurchased (in shares)			(116)
Shares repurchased	(6,863)		$ (6,863)
Other (in shares)			(7)
Other	(30)		$ (21)			(9)
Ending Balance at Jun. 30, 2019	$ 594,000	$ 99,456	$ 888,541	$ (450,433)	$ (7,598)	$ 64,034
Ending Balance (in shares) at Jun. 30, 2019			11,656