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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Income Tax Disclosure [Abstract]
Effective tax rate (as a percentage)	27.10%	1.00%
Decrease in unrecognized tax benefits	$ (100)	$ (10,400)
Unrecognized tax benefits	23,400
Unrecognized tax benefits that would impact effective tax rate favorably, if recognized	20,100
Accrued interest on unrecognized tax benefits	1,100
Possible decrease of unrecognized tax benefits	3,100
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax expense related to items of other comprehensive income	142	217
Pension and Other Post-Retirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax expense related to items of other comprehensive income	$ 142	$ 217

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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)
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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