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Capital Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 17, 2011
Mar. 25, 2011
Jun. 17, 2011
Jun. 18, 2010
Dec. 31, 2010
Capital Stock (Textuals) [Abstract]          
Common stock, shares authorized 200,000,000   200,000,000   200,000,000
Common stock, par value $ 0.01   $ 0.01   $ 0.01
Net proceeds after deduction of offering cost     $ 149,674 $ 209,864  
Common Stock, Dividends, Per Share, Declared $ 0.08 $ 0.08      
Dividends Payable, Date Declared, Day, Month and Year   Mar. 25, 2011      
Common Stock, Dividends, Per Share, Cash Paid $ 0.08 $ 0.08      
Preferred stock, shares authorized 10,000,000   10,000,000   10,000,000
Preferred stock, par value $ 0.01   $ 0.01   $ 0.01
Units of Partnership Interest, Amount 0   0   0
Operating Partnership Units Option To Redeem For Common Stock Ratio     1    
Dividend Paid [Member]
          
Capital Stock (Textuals) [Abstract]          
Subsequent Event, Date Jun. 27, 2011        
Follow On Public Offering [Member]
          
Capital Stock (Textuals) [Abstract]          
Common stock, shares sold   12,418,662      
Underwriters overallotment of shares   1,418,662      
Common stock offering price   $ 12.07      
Net proceeds after deduction of offering cost   $ 149,700