Condensed Consolidated Statement of Shareholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Additional Paid-in Capital	Accumulated Distributions in Excess of Net Income	Accumulated Other Comprehensive Income	Noncontrolling Interest
Beginning balance at Dec. 31, 2016	$ 888,598	$ 92,427	$ 793	$ 1,158,430	$ (384,934)	$ 985	$ 20,897
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares, net of issuance costs	(24)			(24)
Redemption of OP unit holders	(8)				(1)		(7)
Share-based compensation and other expense, net of shares withheld for employee taxes	1,649		1	1,648
Dividends declared to common shareholders	(52,381)				(52,381)
Dividends declared to preferred shareholders	(5,026)				(5,026)
Distributions declared to noncontrolling interests	(1,266)						(1,266)
Dividends declared to deferred shares	(311)				(311)
Other comprehensive income adjustment	287					280	7
Net income	49,295				48,137		1,158
Ending balance at Sep. 30, 2017	$ 880,813	$ 92,427	$ 794	$ 1,160,054	$ (394,516)	$ 1,265	$ 20,789