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Intangibles (Net of Amortization) and Goodwill (Narrative) (Details) - USD ($)
9 Months Ended
Jul. 03, 2017
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Net carrying amount of intangibles and goodwill   $ 137,533,000 $ 144,337,000
Accumulated goodwill impairment   $ 0 $ 0
Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic life, in years   10 years  
Customer Bases [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic life, in years 4 years    
Minimum [Member] | Customer Bases [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic life, in years   4 years  
Minimum [Member] | Formulas And Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic life, in years 3 years 3 years  
Maximum [Member] | Customer Bases [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic life, in years   20 years  
Maximum [Member] | Formulas And Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Estimated economic life, in years 6 years 6 years