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Capital Stock (Details) (USD $)
 0 Months Ended 9 Months Ended 0 Months Ended
Aug. 05, 2013
Jul. 11, 2013
Jun. 28, 2013
Apr. 12, 2013
Mar. 28, 2013
Jan. 10, 2013
Dec. 31, 2012
Sep. 30, 2013
Oct. 10, 2013
Subsequent Event [Member]
Sep. 30, 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    
Stock repurchase program authorized amount $ 100,000,000                  
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]                    
Payment Date   Jul. 11, 2013   Apr. 12, 2013   Jan. 10, 2013     Oct. 10, 2013  
Record Date     Jun. 28, 2013   Mar. 28, 2013   Dec. 31, 2012     Sep. 30, 2013
Dividends per Share (in dollars per share)   $ 0.085   $ 0.085   $ 0.080     $ 0.085