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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Effective tax rate 27.30% 29.20% 32.20% 30.40%
Effective Income Tax Rate Reconciliation, Settlement Proceedings, Excess Tax Benefit, Amount $ 1,200      
Tax benefit associated with stock compensation 900   $ 9,700  
Decrease in unrecognized tax benefits 800      
Unrecognized tax benefits 25,200   25,200  
Increase in unrecognized tax benefits that would impact effective tax rate     300  
Unrecognized tax benefits that would impact effective tax rate 23,200   23,200  
Accrued interest and penalties on unrecognized tax benefits 2,600   2,600  
Decrease in unrecognized tax benefits that are reasonably possibly over the next twelve-month period 900   900  
Income tax expense 153 $ 140 776 $ 424
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 $ 200 $ 100 776 $ 400
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