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Property and Equipment Property and Equipment Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Property, Plant and Equipment [Line Items]          
Depreciation $ 4,100 $ 3,500 $ 8,100 $ 7,000  
Total property and equipment 254,013   254,013   $ 246,333
Accumulated depreciation $ 89,986   $ 89,986   $ 82,237