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Capital Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jan. 31, 2011
Follow On Public Offering [Member]
May 28, 2010
Follow On Public Offering [Member]
Capital Stock (Textuals) [Abstract]          
Common stock, shares authorized 200,000,000 200,000,000      
Common stock, par value (in dollars per share) $ 0.01 $ 0.01      
Common stock, shares sold       12,418,662 23,000,000
Underwriters overallotment of shares       1,418,662 3,000,000
Common stock offering price (in dollars per share)       $ 12.15 $ 8.40
Net proceeds after deduction of offering cost (in dollars) $ 149,632 $ 209,690 $ 204,975 $ 149,600 $ 184,600
Preferred stock, shares authorized 10,000,000 10,000,000      
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01      
Preferred Stock, shares outstanding 0 0      
Units of Partnership Interest, Amount 0 0      
Operating Partnership Units Option To Redeem For Common Stock Ratio 1