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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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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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