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Property and Equipment Property and Equipment Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Property, Plant and Equipment [Line Items]          
Depreciation $ 4,000 $ 3,800 $ 12,100 $ 10,800  
Total property and equipment 258,292   258,292   $ 246,333
Accumulated depreciation $ 93,687   $ 93,687   $ 82,237