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Property and Equipment Property and Equipment Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Depreciation $ 7,000 $ 6,300  
Depreciation and amortization 9,462 $ 8,132  
Property, plant and equipment, gross 212,991   $ 204,229
Accumulated depreciation $ 75,268   $ 68,233