| Common Stock And Earnings Per Share (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | |
|---|---|---|
| Mar. 28, 2020 | Mar. 30, 2019 | |
| Common Stock And Earnings Per Share [Abstract] | ||
| Shares repurchased and retired | 785 | 284 | 
| Repurchase of common stock | $ 57,029 | $ 30,000 | 
| Remaining approved repurchase amount | $ 72,971 | |
| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition The cash outflow to reacquire common stock during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Amount remaining of a stock repurchase plan authorized. No definition available. 
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| X | ||||||||||
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- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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