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Acquisition (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 25, 2016 | Dec. 27, 2015 | Sep. 27, 2015
Business Acquisition [Line Items] |  |  |
Goodwill | $ 604,700,000 | $ 592,695,000 | $ 592,781,000
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 | $ 13,200,000 |  |
Goodwill | $ 11,800,000 |  |

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