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		40,512,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,099			14,991		6,108
Common shares issued (in shares)		3,110,067
Common shares issued	104,148	31	104,117
Issuance of restricted stock (in shares)		117,983
Issuance of restricted stock	0	1	(1)
Forfeiture of restricted stock (in shares)		(941)
Conversion of operating partnership units (in shares)		11,852
Conversion of operating partnership units	0		(133)			133
Dividends declared and paid	(39,988)			(28,170)		(11,818)
Stock-based compensation	2,571		2,571
Shares withheld for employee taxes (in shares)		(136,611)
Shares withheld for employee taxes	(4,319)	(1)	(4,318)
Other comprehensive income - change in value of interest rate swap	882				624	258
Ending Balance at Sep. 30, 2014	$ 770,971	$ 436	$ 794,432	$ (57,269)	$ 624	$ 32,748
Ending Balance (in shares) at Sep. 30, 2014		43,614,913