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Capital Stock (Details) (USD $)
 0 Months Ended 3 Months Ended
Apr. 04, 2012
Jan. 10, 2012
Mar. 23, 2012
Dec. 31, 2011
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, dividends, per share, declared (in dollars per share) $ 0.08 $ 0.08    
Dividends Payable, Date to be Paid, Day, Month and Year   Jan. 10, 2012    
Dividends Payable, Date of Record, Day, Month and Year   Dec. 30, 2011    
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  
Dividend Paid [Member]
        
Capital Stock (Textuals) [Abstract]        
Dividends Payable, Date to be Paid, Day, Month and Year Apr. 04, 2012      
Dividends Payable, Date of Record, Day, Month and Year Mar. 23, 2012