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Shareholders' Equity (Share Repurchase) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 27, 2019 | Dec. 26, 2018 | Mar. 28, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |
Purchase of treasury stock | $ 8,941 |  | $ 16,186
Number of accumulated shares repurchased (in shares) | 47,948 | 47,052 |
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) | 500 |  |
Purchase of treasury stock | $ 8,900 |  |
Remaining shares to be repurchased (in dollars) | $ 119,500 |  |
Number of accumulated shares repurchased (in shares) | 5,100 |  |
Value of shares repurchased | $ 80,500 |  |
Accelerated Share Repurchase 2018 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Share repurchase, authorized amount (in dollars) |  | $ 25,000 |
Purchase of treasury stock (in shares) | 400 | 1,100 |
Purchase of treasury stock | $ 6,800 | $ 18,200 |
Remaining shares to be repurchased (in dollars) |  | $ 6,800 |
Volume-weighted average price | $ 17.04 |  |

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