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Shareholders' Equity (Share Repurchase) (Details) - USD ($) shares in Thousands, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 27, 2018 | Dec. 27, 2017
Equity, Class of Treasury Stock [Line Items] |  |
Purchase of treasury stock | $ 28,844 |
Number of accumulated shares repurchased (in shares) | 45,014 | 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) | 1,900 |
Purchase of treasury stock | $ 28,800 |
Number of accumulated shares repurchased (in shares) | 2,100 |
Value of shares repurchased | $ 32,500 |
Remaining shares to be repurchased (in dollars) | $ 167,500 |

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