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Property and Equipment Property and Equipment Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Dec. 30, 2017
Property, Plant and Equipment [Line Items]      
Depreciation $ 4,000 $ 3,500  
Total property and equipment 250,213   $ 246,333
Accumulated depreciation $ 85,977   $ 82,237