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Significant Accounting Policies – Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 25, 2016 | Dec. 27, 2015 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating leases, remaining rental payments |  |  |  | $ 214,070
Future expected sublease rental income |  |  |  | $ 79,560
Accounting Standards Update 2016-09 | Restatement |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase in net cash provided by operating activities due to retrospective application of ASU 2016-09 | $ 6,200 | $ 10,200 |  |
Increase in net cash used in financing activities due to retrospective application of ASU 2016-09 | $ 6,200 | $ 10,200 |  |
Accounting Standards Update 2014-09 | Forecast | Minimum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Expected decrease before income tax effects to opening balance of retained earnings |  |  | $ 20,000 |
Accounting Standards Update 2014-09 | Forecast | Maximum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Expected decrease before income tax effects to opening balance of retained earnings |  |  | $ 25,000 |

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