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Property and Equipment Property and Equipment Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Dec. 29, 2018
Property, Plant and Equipment [Line Items]      
Depreciation $ 4,300 $ 4,000  
Total property and equipment 269,370   $ 263,762
Accumulated depreciation $ 102,082   $ 97,790