Consolidated Statements of Changes in Equity (USD $) In Thousands, except Share data, unless otherwise specified	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit and Distributions	Total Shareholders' Equity	Noncontrolling Interest Operating partnership	Noncontrolling Interest Joint venture	Total
Balance at beginning of year at Dec. 31, 2013	$ 84	$ 854	$ 882,858	$ (1,379)	$ (72,577)	$ 809,840	$ 4,722	$ 7,816	$ 822,378
Balance (in shares) at Dec. 31, 2013	8,400,000	85,402,408
Changes in equity
Common stock redemption of common units		1	26			27	(27)
Common stock redemption of common units (in shares)		126,155
Common units issued for acquisition							3,685		3,685
Dividends paid					(13,769)	(13,769)	(123)		(13,892)
Equity-based compensation			461			461	6		467
Other comprehensive loss				(67)		(67)	(1)		(68)
Net income					3,458	3,458	(10)	(123)	3,325
Balance at end of year at Mar. 31, 2014	84	855	883,345	(1,446)	(82,888)	799,950	8,252	7,693	815,895
Balance (in shares) at Mar. 31, 2014	8,400,000	85,528,563
Balance at beginning of year at Dec. 31, 2014	84	861	888,191	(1,746)	(107,779)	779,611	5,590		785,201
Balance (in shares) at Dec. 31, 2014	8,400,000	86,149,720
Changes in equity
Common stock redemption of common units			147			147	(147)
Common stock redemption of common units (in shares)		20,691
Dividends paid					(14,276)	(14,276)	(89)		(14,365)
Equity-based compensation		3	627			630	6		636
Equity-based compensation (in shares)		257,885
Other			(450)			(450)			(450)
Other (in shares)		(36,116)
Other comprehensive loss				(754)		(754)	(7)		(761)
Net income					10,534	10,534	57		10,591
Balance at end of year at Mar. 31, 2015	$ 84	$ 864	$ 888,515	$ (2,500)	$ (111,521)	$ 775,442	$ 5,410		$ 780,852
Balance (in shares) at Mar. 31, 2015	8,400,000	86,392,180