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Capital Stock (Details) (USD $)
 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Jan. 10, 2013
Dec. 31, 2012
Mar. 31, 2013
Apr. 12, 2013
Subsequent Event [Member]
Mar. 31, 2013
Subsequent Event [Member]
Equity [Abstract]          
Common stock, shares authorized   400,000,000 400,000,000    
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01    
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    
Operating Partnership Units Option To Redeem For Common Stock Ratio     1    
Units of Partnership Interest, Amount   0 0    
Subsequent Event [Line Items]          
Dividends Payable, Date to be Paid Jan. 10, 2013     Apr. 12, 2013  
Dividends Payable, Date of Record, Day, Month and Year   Dec. 31, 2012     Mar. 28, 2013
Common stock, dividends, per share, declared (in dollars per share) $ 0.080     $ 0.085