Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Basic earnings:
Net income (loss) attributable to common stockholders	$ 1,006	$ (1,635)
Diluted earnings:
Net income (loss) attributable to common stockholders	1,006	(1,635)
Add: net income (loss) attributable to noncontrolling interests	11	(9)
Net income (loss) attributable to common stockholders and participating securities	$ 1,017	$ (1,644)
Weighted average common shares outstanding:
Basic	46,156	30,923
Incremental shares from assumed conversion unrestricted and restricted OP units	435	0
Diluted	46,591	30,923
Basic income (loss) per share	$ 0.02	$ (0.05)
Diluted income (loss) per share	$ 0.02	$ (0.05)