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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jun. 25, 2016 | Jul. 01, 2017 | Jun. 25, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Effective tax rate | 28.90% | 34.60% | 34.40% | 31.00%
Tax benefit associated with stock compensation | $ 1,300 |  | $ 8,800 |
Increase in unrecognized tax benefits | 900 |  |  |
Unrecognized tax benefits | 26,000 |  | 26,000 |
Increase in unrecognized tax benefits that would impact effective tax rate |  |  | 700 |
Unrecognized tax benefits that would impact effective tax rate | 22,900 |  | 22,900 |
Accrued interest and penalties on unrecognized tax benefits | 2,400 |  | 2,400 |
Decrease in unrecognized tax benefits that are reasonably possibly over the next twelve-month period | 5,000 |  | 5,000 |
Income tax expense | 397 | $ 142 | 623 | $ 284
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 | $ 400 | $ 100 | 623 | $ 300
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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