Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit and Distributions	Total Stockholders’ Equity	Non-controlling Interests in Operating Partnership
Balance at beginning of year at Dec. 31, 2014	$ 785,201	$ 84	$ 861	$ 888,191	$ (1,746)	$ (107,779)	$ 779,611	$ 5,590
Balance (in shares) at Dec. 31, 2014		8,400,000	86,149,720
Changes in equity
Common stock redemption of common units			$ 0	147			147	(147)
Common Unit redemptions	20,691		20,691
Dividends paid	$ (14,365)					(14,276)	(14,276)	(89)
Equity-based compensation	636		$ 3	627			630	6
Equity-based compensation (in shares)			257,885
Other	(450)			(450)			(450)
Other (in shares)			(36,116)
Other comprehensive loss	(761)				(754)		(754)	(7)
Net income	10,591					10,534	10,534	57
Balance at end of year at Mar. 31, 2015	780,852	$ 84	$ 864	888,515	(2,500)	(111,521)	775,442	5,410
Balance (in shares) at Mar. 31, 2015		8,400,000	86,392,180
Balance at beginning of year at Dec. 31, 2015	$ 856,926	$ 84	$ 868	894,060	(1,666)	(40,635)	852,711	4,215
Balance (in shares) at Dec. 31, 2015		8,400,000	86,793,521
Changes in equity
Common stock redemption of common units			$ 0	254			254	(254)
Common Unit redemptions	31,042		31,042
Dividends paid	$ (14,402)					(14,345)	(14,345)	(57)
Equity-based compensation	793		$ 4	785			789	4
Equity-based compensation (in shares)			448,342
Other	(617)			(617)			(617)
Other (in shares)			(53,059)
Other comprehensive loss	(632)				(628)		(628)	(4)
Net income	48,734					48,485	48,485	249
Balance at end of year at Mar. 31, 2016	$ 890,802	$ 84	$ 872	$ 894,482	$ (2,294)	$ (6,495)	$ 886,649	$ 4,153
Balance (in shares) at Mar. 31, 2016		8,400,000	87,219,846