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Revenue From Contracts With Customers Revenue From Contracts With Customers (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 29, 2018
Dec. 29, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Contract liabilities $ 3,200,000 $ 3,200,000 $ 2,200,000
Revenue recognized that was included in contract liability balance at beginning of period 900,000 1,300,000  
Contract assets $ 0 $ 0 $ 0
Minimum [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Payment terms   30 days  
Maximum [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Payment terms   90 days