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Shareholders' Equity (Share Repurchase) (Details) - USD ($) shares in Thousands, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 26, 2018 | Dec. 27, 2017
Equity, Class of Treasury Stock [Line Items] |  |
Purchase of treasury stock | $ 37,407 |
Number of accumulated shares repurchased (in shares) | 45,588 | 43,151
Share Repurchase Program 2017 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Share repurchase, authorized amount (in dollars) | $ 200,000 |
Purchase of treasury stock (in shares) | 2,400 |
Purchase of treasury stock | $ 37,400 |
Number of accumulated shares repurchased (in shares) | 2,700 |
Value of shares repurchased | $ 41,100 |
Remaining shares to be repurchased (in dollars) | $ 158,900 |

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