Quarterly report pursuant to Section 13 or 15(d)

Recent Accounting Pronouncements Revenue Recognition (Details)

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Recent Accounting Pronouncements Revenue Recognition (Details) - Accounting Standards Update 2014-09 [Member]
$ in Thousands
 9 Months Ended
Sep. 29, 2018
USD ($)
Retained Earnings [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 7,852
Other Current Assets [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 3,846
Other Noncurrent Assets [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 3,370
Other Current Liabilities [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ 637