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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 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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