Quarterly report pursuant to Section 13 or 15(d)

Common Stock And Earnings Per Share (Narrative) (Details)

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Common Stock And Earnings Per Share (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 02, 2018
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Oct. 23, 2018
Common Stock And Earnings Per Share [Line Items]            
Shares repurchased and retired   178 865 217 865  
Repurchase of common stock   $ 22,647 $ 50,000 $ 25,590 $ 50,000  
Remaining approved repurchase amount   $ 24,410   $ 24,410    
Subsequent Event [Member]            
Common Stock And Earnings Per Share [Line Items]            
Shares repurchased and retired 235          
Repurchase of common stock $ 26,677          
Average market price $ 113.57          
Stock Repurchase Program, Authorized Amount           $ 150,000