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Property and Equipment Property and Equipment Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Depreciation $ 3,500 $ 3,100  
Depreciation and amortization 4,736 $ 4,051  
Property, plant and equipment, gross 207,827   $ 204,229
Accumulated depreciation $ 71,672   $ 68,233