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Capital Stock (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended
Jul. 11, 2012
Jul. 12, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jul. 09, 2012
Jan. 31, 2011
Follow On Public Offering [Member]
Capital Stock (Textuals) [Abstract]              
Common stock, par value (in dollars per share)     $ 0.01 $ 0.01      
Common stock, shares authorized     400,000,000 400,000,000   200,000,000  
Common stock, shares sold 20,000,000           12,418,662
Net proceeds after deduction of offering cost (in dollars) $ 199,800,000   $ 199,790,000 $ 149,632,000 $ 209,690,000   $ 149,600,000
Underwriters overallotment of shares             1,418,662
Common stock offering price (in dollars per share)             $ 12.15
Stock Issued During Period, Value, New Issues   $ 75,000,000 $ 199,790,000 $ 149,632,000 $ 209,690,000    
Lock up agreement period (in days)   150 days          
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