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Capital Stock (Details) (USD $)
 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Apr. 12, 2013
Jan. 10, 2013
Dec. 31, 2012
Jun. 30, 2013
Aug. 05, 2013
Subsequent Event [Member]
Jul. 11, 2013
Subsequent Event [Member]
Jun. 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      
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 Apr. 12, 2013 Jan. 10, 2013       Jul. 11, 2013  
Record Date     Dec. 31, 2012 Mar. 28, 2013     Jun. 28, 2013
Dividends per Share (in dollars per share) $ 0.085 $ 0.080       $ 0.085  
Stock repurchase program authorized amount         $ 100,000,000