Share-Based Compensation Plan (Details Textual) (USD $)			12 Months Ended						1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Restricted Stock [Member] years	Dec. 31, 2010 Restricted Stock [Member]	Dec. 31, 2009 Restricted Stock [Member]	Dec. 31, 2011 Long Term Incentive Partnership Units [Member] years	Dec. 31, 2010 Long Term Incentive Partnership Units [Member]	Dec. 31, 2009 Long Term Incentive Partnership Units [Member]	Feb. 29, 2012 Minimum [Member]	Dec. 31, 2011 Minimum [Member] Restricted Stock [Member]	Feb. 29, 2012 Maximum [Member]	Dec. 31, 2011 Maximum [Member] Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted stock vesting period									3 years	3 years	5 years	5 years
Weighted average remaining vesting period			1.8			3
Expense related to restricted shares			$ 1,100,000	$ 500,000	$ 5,000	$ 1,600,000	$ 1,600,000	$ 100,000
Total unrecognized compensation cost			$ 1,900,000			$ 4,700,000	$ 6,200,000
Share-Based Compensation Plan (Textual) [Abstract]
Number of common shares available for issuance under the 2009 Equity Incentive Plan	224,317
Operating Partnership outstanding	929,099	929,099
LTIP unit grants were valued at per unit	$ 8.50
LTIP units, vested	362,170	185,820