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Acquisition (Details) - USD ($) $ in Thousands | 7 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 13, 2016 | Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 573,063 | $ 570,555 | $ 592,695
Boulder Media [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date Of Acquisition | Jul. 13, 2016 |  |  |
Business Acquisition, Name Of Acquired Entity | Boulder Media Limited |  |  |
Payments To Acquire Businesses, Gross | $ 13,177 |  |  |
Goodwill | $ 11,821 |  |  |

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