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Contingencies (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 29, 2018
Dec. 31, 2012
Site Contingency [Line Items]    
Litigation Settlement, Amount   $ 110,000
Environmental Costs Recovered $ 37,000  
Huntsville Site [Member]    
Site Contingency [Line Items]    
Environmental Remediation Expense To Date 6,100  
Additional Expected Project Expenditures Low Estimate 4,300  
Additional Expected Project Expenditures High Estimate 10,000  
Norco Site [Member] | Remediation, Project Management, Regulatory Oversight, and Investigative and Feasability Studies [Member]    
Site Contingency [Line Items]    
Environmental Remediation Expense To Date 67,500  
Additional Expected Project Expenditures Low Estimate 14,300  
Additional Expected Project Expenditures High Estimate $ 25,000