CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total Stockholders' Equity	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Distributions in Excess of Net Income	Noncontrolling Interests	Total
Balance at Dec. 31, 2012	$ 338,229	$ 115,000	$ 207	$ 259,009		$ (35,987)	$ 372,544	$ 710,773
Balance (in shares) at Dec. 31, 2012			21,202,673
Increase (Decrease) in Stockholders' Equity
Issuance of stock awards, net of forfeitures	1		$ 1					1
Issuance of stock awards, net of forfeitures (in shares)			129,698
Exercise of stock options, net of settlements	925		$ 1	924				925
Exercise of stock options, net of settlements (in shares)			54,781
Share-based compensation	7,559			7,559				7,559
Offering costs	(27)			(27)				(27)
Dividends declared on preferred stock	(8,338)					(8,338)		(8,338)
Dividends and distributions	(24,780)					(24,780)	(29,418)	(54,198)
Net income	18,841					18,841	12,771	31,612
Balance at Dec. 31, 2013	332,410	115,000	$ 209	267,465		(50,264)	355,897	688,307
Balance (in shares) at Dec. 31, 2013			21,387,152
Increase (Decrease) in Stockholders' Equity
Issuance of stock awards, net of forfeitures (in shares)			181,124
Exercise of stock options, net of settlements	945		$ 1	944				945
Exercise of stock options, net of settlements (in shares)			189,090
Share-based compensation	6,631		$ 2	6,629				6,631
Dividends declared on preferred stock	(8,338)					(8,338)		(8,338)
Dividends and distributions	(31,701)					(31,701)	(37,280)	(68,981)
Net income	22,765					22,765	17,287	40,052
Other comprehensive loss	(125)				$ (125)		(150)	(275)
Balance at Dec. 31, 2014	322,587	115,000	$ 212	275,038	(125)	(67,538)	335,754	658,341
Balance (in shares) at Dec. 31, 2014			21,757,366
Increase (Decrease) in Stockholders' Equity
Issuance of stock awards, net of forfeitures (in shares)			207,937
Exercise of stock options, net of settlements	(2,863)		$ 3	(2,866)				(2,863)
Exercise of stock options, net of settlements (in shares)			185,400
Share-based compensation	7,633		$ 1	7,632				7,633
Dividends declared on preferred stock	(8,338)					(8,338)		(8,338)
Dividends and distributions	(47,721)					(47,721)	(37,110)	(84,831)
Net income	34,706					34,706	22,153	56,859
Other comprehensive loss	(67)				(67)		(429)	(496)
Redemption of noncontrolling interests	110,180		$ 85	110,396	(301)		(110,180)
Redemption of noncontrolling interests (in shares)			8,500,000
Balance at Dec. 31, 2015	$ 416,117	$ 115,000	$ 301	$ 390,200	$ (493)	$ (88,891)	$ 210,188	$ 626,305
Balance (in shares) at Dec. 31, 2015			30,650,703