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Revenue - Subscription, Advertising, and Other Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2018
Mar. 26, 2017
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 413,948 $ 398,804
Rental income, not subject to ASC 606 5,000 6,000
Subscription    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 260,593 242,375
Advertising    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 125,647 130,028
Other    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 27,708 $ 26,401