Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Components of accumulated other comprehensive loss
Balance at the beginning of the period			$ (9,340)	$ (13,842)
Other comprehensive income before reclassifications	(1,550)		(1,550)
Amounts reclassified from accumulated other comprehensive income	36	117	83	250
Currency translation	798	(1,035)	(140)	(1,611)
Net current period other comprehensive income			(1,607)	(1,361)
Balance at the end of the period	(10,947)	(15,203)	(10,947)	(15,203)
Unrecognized Prior Service Cost
Components of accumulated other comprehensive loss
Balance at the beginning of the period			653	825
Other comprehensive income before reclassifications			(97)
Amounts reclassified from accumulated other comprehensive income			(76)	(86)
Net current period other comprehensive income			(173)	(86)
Balance at the end of the period	480	739	480	739
Unrecognized Loss
Components of accumulated other comprehensive loss
Balance at the beginning of the period			(10,836)	(17,399)
Other comprehensive income before reclassifications			(1,453)
Amounts reclassified from accumulated other comprehensive income			159	336
Net current period other comprehensive income			(1,294)	336
Balance at the end of the period	(12,130)	(17,063)	(12,130)	(17,063)
Foreign Currency Translation
Components of accumulated other comprehensive loss
Balance at the beginning of the period			843	2,722
Currency translation			(140)	(1,611)
Net current period other comprehensive income			(140)	(1,611)
Balance at the end of the period	$ 703	$ 1,121	$ 703	$ 1,121

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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- Definition

Amount after tax, before reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement benefit plans.

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Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans.

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No definition available.

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