CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Distributions in Excess of Net Income	Total Stockholders' Equity	Noncontrolling Interests	Total
Balance at Dec. 31, 2013	$ 115,000	$ 209	$ 267,465		$ (50,264)	$ 332,410	$ 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		$ 1	944			945		945
Exercise of stock options, net of settlements (in shares)		189,090
Share-based compensation		$ 2	6,629			6,631		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 income (loss)				$ (125)		(125)	(150)	(275)
Balance at Dec. 31, 2014	115,000	$ 212	275,038	(125)	(67,538)	322,587	335,754	658,341
Balance (in shares) at Dec. 31, 2014		21,757,366
Increase (Decrease) in Stockholders' Equity
Redemption of noncontrolling interests		$ 85	110,396	(301)		110,180	(110,180)
Redemption of noncontrolling interests (in shares)		8,500,000
Issuance of stock awards, net of forfeitures (in shares)		207,937
Exercise of stock options, net of settlements		$ 3	(2,866)			(2,863)		(2,863)
Exercise of stock options, net of settlements (in shares)		185,400
Share-based compensation		$ 1	7,632			7,633		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 income (loss)				(67)		(67)	(429)	(496)
Balance at Dec. 31, 2015	115,000	$ 301	390,200	(493)	(88,891)	416,117	210,188	626,305
Balance (in shares) at Dec. 31, 2015		30,650,703
Increase (Decrease) in Stockholders' Equity
Redemption of noncontrolling interests		$ 30	37,550	(206)		37,374	(37,374)
Redemption of noncontrolling interests (in shares)		3,007,000
Issuance of stock awards, net of forfeitures (in shares)		164,408
Exercise of stock options, net of settlements		$ 1	1,289			1,290		1,290
Exercise of stock options, net of settlements (in shares)		74,660
Share-based compensation		$ 2	9,492			9,494		9,494
Dividends declared on preferred stock					(8,338)	(8,338)		(8,338)
Dividends and distributions					(79,518)	(79,518)	(34,696)	(114,214)
Net income					58,709	58,709	23,212	81,921
Other comprehensive income (loss)				598		598	30	628
Balance at Dec. 31, 2016	$ 115,000	$ 334	$ 438,531	$ (101)	$ (118,038)	$ 435,726	$ 161,360	$ 597,086
Balance (in shares) at Dec. 31, 2016		33,896,771