Consolidated Statement of Changes in Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Shares [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interests [Member]
Beginning Balance, at Dec. 31, 2012	$ 172,887	$ 16	$ 224,237	$ (57,830)	$ (392)	$ 166,031	$ 6,856
Beginning Balance (in units), at Dec. 31, 2012							685,000
Beginning Balance (in shares), at Dec. 31, 2012	16,943,098	16,943,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of noncontrolling interest OP units for common shares (in shares)		106,000					106,000
Exchange of noncontrolling interest OP units for common shares	0	1	1,056		(1)	1,056	(1,056)
Exchange offer costs	(23)		(23)			(23)
Issuance of shares under dividend reinvestment plan (in shares)		3,000
Issuance of shares under dividend reinvestment plan	47		47			47
Share-based compensation (in shares)		1,000
Share-based compensation	599		599			599
Distributions	(9,982)			(9,644)		(9,644)	(338)
Unrealized gain on change in value of cash flow hedge	493				476	476	17
Unrealized gain on change in fair value of available-for-sale marketable securities	215				207	207	8
Net income	1,989			1,919		1,919	70
Ending Balance, at Jun. 30, 2013	$ 166,225	$ 17	$ 225,916	$ (65,555)	$ 290	$ 160,668	$ 5,557
Ending Balance (in units), at Jun. 30, 2013							579,000
Ending Balance (in shares), at Jun. 30, 2013	17,052,980	17,053,000