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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Effective tax rate 15.50% 39.80%
Tax benefit from favorable taxing authority rulings $ 2,700  
Decrease in unrecognized tax benefits 3,700 $ 3,500
Unrecognized tax benefits 21,000  
Unrecognized tax benefits that would impact effective tax rate 19,300  
Accrued interest and penalties on unrecognized tax benefits 2,600  
Decrease in unrecognized tax benefits that are reasonably possibly over the next twelve-month period 1,900  
Income tax expense (benefit) 1,722 226
Pension and Other Post-Retirement Benefit Plans    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income tax expense (benefit) (118) 200
Foreign Currency Translation Adjustment and Other    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income tax expense (benefit) $ 1,840  
CDMO Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Tax on gain on divestiture   $ 18,000