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	NONREDEEMABLE NONCONTROLLING INTERESTS
Balance at Dec. 31, 2017	$ 714,043	$ 99,456	$ 902,305	$ (374,365)	$ (539)	$ 87,186
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	6,885			6,604		281
Change in fair value of derivatives	1,822				1,822
Distributions – common shares and units ($0.70 per share and unit)	(9,395)			(8,405)		(990)
Distributions – Series C preferred shares ($0.4140625 per Series C share)	(1,705)			(1,705)
Shares issued and share-based compensation (in shares)			2
Shares issued and share-based compensation	441		$ 441
Redemption of units for common shares (in shares)			2
Redemption of units for common shares	0		$ 34			(34)
Redemption of units for cash	(2,237)					(2,237)
Shares repurchased (in shares)			(29)
Shares repurchased	(1,442)		$ (1,442)
Other	55		(26)			(81)
Balance at Mar. 31, 2018	708,467	99,456	$ 901,312	(377,871)	1,283	84,287
Balance (in shares) at Mar. 31, 2018			11,979
Balance at Dec. 31, 2018	643,449	99,456	$ 899,234	(429,048)	(856)	74,663
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	(5,843)			(4,698)		(1,145)
Change in fair value of derivatives	(2,283)				(2,283)
Distributions – common shares and units ($0.70 per share and unit)	(9,167)			(8,210)		(957)
Distributions – Series C preferred shares ($0.4140625 per Series C share)	(1,705)			(1,705)
Shares issued and share-based compensation	436		$ 436
Redemption of units for cash	(156)					(156)
Shares repurchased (in shares)			(174)
Shares repurchased	(8,815)		$ (8,815)
Acquisition of redeemable noncontrolling interests	4,549		4,549
Other	(73)		(23)			(50)
Balance at Mar. 31, 2019	$ 620,392	$ 99,456	$ 895,381	$ (443,661)	$ (3,139)	$ 72,355
Balance (in shares) at Mar. 31, 2019			11,768