Consolidated Statement of Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Shares	Additional Paid-in Capital	Accumulated Dividends in Excess of Net Income	Accumulated Other Comprehensive Loss	Noncontrolling Interests - Unitholders in the Operating Partnership
Beginning Balance at Dec. 31, 2013	$ 686,578	$ 405	$ 692,196	$ (44,090)	$ 0	$ 38,067
Beginning Balance (in shares) at Dec. 31, 2013	405,812,563	40,512,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,658			4,672		1,986
Common shares issued (in shares)		1,435,215
Common shares issued	46,926	14	46,912
Issuance of restricted stock (in shares)		112,119
Issuance of restricted stock	0	1	(1)
Conversion of operating partnership units (in shares)	11,852	11,852
Conversion of operating partnership units	0		(133)			133
Dividends declared and paid	(13,140)			(9,201)		(3,939)
Stock-based compensation	519		519
Shares withheld for employee taxes (in shares)		(136,611)
Shares withheld for employee taxes	(4,319)	(1)	(4,318)
Other comprehensive loss - change in value of interest rate swap	(746)				(521)	(225)
Ending Balance at Mar. 31, 2014	$ 722,476	$ 419	$ 735,175	$ (48,619)	$ (521)	$ 36,022
Ending Balance (in shares) at Mar. 31, 2014	41,935,138	41,935,138