Consolidated Statements of Changes in Equity (USD $) In Thousands	Total	Common Stock	Paid-in Capital	Distributions in Excess of Accumulated Earnings	Non-controlling interests - Common OP Units	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2010	$ 260,158	$ 310	$ 463,722	$ (237,002)	$ 33,128
Conversion of OP Units to common stock		2	981		(983)
Issuance of common stock through exercise of options	235		235
Issuance of common stock through employee stock purchase plan	437		437
Compensation expenses related to stock options and restricted stock	2,969		2,969
Repurchase of common stock or Common OP Units	(216)		(216)
Adjustment for Common OP Unitholders in the Operating Partnership			(31,500)		31,500
Common stock offering	344,049	60	343,989
Adjustment for fair market value of swap	(336)					(336)
Net income	29,197			25,787	3,410
Distributions	(28,906)			(25,673)	(3,233)
Ending Balance at Jun. 30, 2011	$ 607,587	$ 372	$ 780,617	$ (236,888)	$ 63,822	$ (336)