CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, except Share data	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit and Distributions	Total Stockholders' Equity	Operating Partnership	Joint Venture
Balance at Dec. 31, 2011	$ 319,449	$ 20	$ 273	$ 288,902		$ (11,020)	$ 278,175	$ 41,274
Balance (in shares) at Dec. 31, 2011		2,000,000	27,278,000
Registration and offering costs	(349)			(349)			(349)
Common stock redemption of common units			33	(9,061)			(9,028)	9,028
Common stock redemption of common units (in shares)			3,270,062
Dividends paid	(10,735)					(8,830)	(8,830)	(1,905)
Equity-based compensation	515		2	419			421	94
Equity-based compensation (in shares)			208,027
Other comprehensive income (loss)	(280)				(229)		(229)	(51)
Net income (loss)	(3,161)					(1,816)	(1,816)	(1,345)
Balance at Jun. 30, 2012	305,439	20	308	279,911	(229)	(21,666)	258,344	47,095
Balance (in shares) at Jun. 30, 2012		2,000,000	30,756,089
Balance at Dec. 31, 2012	473,537	50	462	468,820	(528)	(31,985)	436,819	36,718
Balance (in shares) at Dec. 31, 2012		5,000,000	46,159,652
Net proceeds from sale of common stock	148,039		172	147,867			148,039
Net proceeds from sale of common stock (in shares)			17,250,000
Net proceeds from sale of preferred stock	81,723	34		81,689			81,723
Net proceeds from sale of preferred stock (in shares)		3,400,000
Common stock redemption of common units			23	6,727			6,750	(6,750)
Common stock redemption of common units (in shares)			2,228,544
Contribution by noncontrolling interests in joint venture	7,500								7,500
Dividends paid	(21,843)					(21,140)	(21,140)	(703)
Equity-based compensation	1,270		3	1,267			1,270
Equity-based compensation (in shares)			324,341
Other comprehensive income (loss)	817				779		779	38
Net income (loss)	8,553					8,396	8,396	105	52
Balance at Jun. 30, 2013	$ 699,596	$ 84	$ 660	$ 706,370	$ 251	$ (44,729)	$ 662,636	$ 29,408	$ 7,552
Balance (in shares) at Jun. 30, 2013		8,400,000	65,962,537