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Common Stock And Earnings Per Share (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Common Stock And Earnings Per Share [Abstract]    
Shares repurchased and retired 39 0
Repurchase of common stock $ 2,943  
Remaining approved repurchase amount $ 47,057