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Shareholders' Deficit (Share Repurchase) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 26, 2019 | Dec. 26, 2018 | Jun. 27, 2018 | Jun. 26, 2019 | Jun. 27, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Purchase of treasury stock | $ 29,056 |  | $ 12,658 | $ 37,997 | $ 28,844
Number of accumulated shares repurchased (in shares) | 49,484 | 47,052 |  | 49,484 |
Share Repurchase Program 2017 [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Share repurchase, authorized amount (in dollars) | $ 200,000 |  |  | $ 200,000 |
Purchase of treasury stock (in shares) |  |  |  | 2,000 |
Purchase of treasury stock |  |  |  | $ 38,000 |
Remaining shares to be repurchased (in dollars) | $ 90,400 |  |  | $ 90,400 |
Number of accumulated shares repurchased (in shares) | 6,600 |  |  | 6,600 |
Value of shares repurchased | $ 109,600 |  |  | $ 109,600 |
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) |  | 1,100 |  | 400 |
Purchase of treasury stock |  | $ 18,200 |  | $ 6,800 |
Remaining shares to be repurchased (in dollars) |  | $ 6,800 |  |  |
Volume-weighted average price |  |  |  | $ 17.04 |

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