Accumulated Other Comprehensive (Loss) Income - Summary of Components of Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 27, 2015	Sep. 30, 2016	Sep. 27, 2015
Foreign currency transaction loss
Foreign currency transaction gain (loss)	$ 165	$ (3,076)	$ 1,656	$ 4,640
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period			(99,005)
Total accumulated other comprehensive (loss) income, end of period	(97,178)		(97,178)
Accumulated other comprehensive (loss) income
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(97,649)	(101,900)	(99,005)	(104,233)
Gain (Loss) recognized in OCI, Net	(565)	(5)	(1,354)	2,090
Gain (Loss) reclassified from AOCI to income, Net	1,036	120	3,181	358
Total accumulated other comprehensive (loss) income, end of period	(97,178)	(101,785)	(97,178)	(101,785)
Changes in fair market value of hedges
Changes in AOCI, Gross
Gross, beginning of the period	(403)	(1,047)	(768)	(1,020)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(643)	(219)	(742)	(628)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	221	192	685	574
Gross, ending balance	(825)	(1,074)	(825)	(1,074)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	151	394	289	384
Income tax (benefit), Gain (Loss) recognized in OCI	242	82	278	236
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	(83)	(72)	(257)	(216)
Income tax (benefit), ending of period	310	404	310	404
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(252)	(653)	(479)	(636)
Gain (Loss) recognized in OCI, Net	(401)	(137)	(464)	(392)
Gain (Loss) reclassified from AOCI to income, Net	138	120	428	358
Total accumulated other comprehensive (loss) income, end of period	(515)	(670)	(515)	(670)
Changes in unrealized pension cost
Changes in AOCI, Gross
Gross, beginning of the period	(158,763)	(166,161)	(161,719)	(169,291)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	2,039	0	5,169
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,437	0	4,393	0
Gross, ending balance	(157,326)	(164,122)	(157,326)	(164,122)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	63,260	63,957	64,361	65,124
Income tax (benefit), Gain (Loss) recognized in OCI	0	(703)	0	(1,870)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	(539)	0	(1,640)	0
Income tax (benefit), ending of period	62,721	63,254	62,721	63,254
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(95,503)	(102,204)	(97,358)	(104,167)
Gain (Loss) recognized in OCI, Net	0	1,336	0	3,299
Gain (Loss) reclassified from AOCI to income, Net	898	0	2,753	0
Total accumulated other comprehensive (loss) income, end of period	(94,605)	(100,868)	(94,605)	(100,868)
Cumulative translation adjustment
Changes in AOCI, Gross
Gross, beginning of the period	(1,995)	572	(1,279)	245
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(161)	(1,056)	(877)	(729)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0	0	0
Gross, ending balance	(2,156)	(484)	(2,156)	(484)
Changes in AOCI, Income tax (benefit)
Income tax (benefit), beginning of period	101	385	111	325
Income tax (benefit), Gain (Loss) recognized in OCI	(3)	(148)	(13)	(88)
Income tax (benefit), Gain (Loss) reclassified from AOCI to income	0	0	0	0
Income tax (benefit), ending of period	98	237	98	237
AOCI Attributable to Parent, Net of Tax
Total accumulated other comprehensive (loss) income, beginning of period	(1,894)	957	(1,168)	570
Gain (Loss) recognized in OCI, Net	(164)	(1,204)	(890)	(817)
Gain (Loss) reclassified from AOCI to income, Net	0	0	0	0
Total accumulated other comprehensive (loss) income, end of period	$ (2,058)	$ (247)	$ (2,058)	$ (247)

Accumulated Other Comprehensive Income Loss Tax

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Reclassification Adjustment Out Of Accumulated Other Comprehensive Income Abstract

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).

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