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Capital Stock and Dividends (Details) - $ / shares
3 Months Ended 6 Months Ended
Aug. 08, 2018
May 09, 2018
Feb. 07, 2018
May 08, 2017
Feb. 08, 2017
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dividends                  
Common Stock, Dividends, Per Share, Declared   $ 0.31 $ 0.27 $ 0.27 $ 0.24 $ 0.31 $ 0.27 $ 0.58 $ 0.51
Subsequent Event                  
Dividends                  
Common Stock, Dividends, Per Share, Declared $ 0.31