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 Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Oct. 01, 2016
Common Stock And Earnings Per Share [Abstract]      
Shares repurchased and retired 865 865 1,106
Repurchase of common stock $ 50,000 $ 50,000 $ 64,610
Value of shares repurchased and retired   50,000  
Remaining approved repurchase amount $ 50,000 $ 50,000