Condensed Consolidated Statements of Comprehensive Earnings (Loss) - (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 8,117	$ 6,819	$ 19,558	$ (948)
Other comprehensive earnings (loss):
Changes in fair market value of hedges, net of tax	153	(210)	26	373
Changes in unrealized pension cost, net of tax	1,036	1,172	2,857	4,046
Cumulative translation adjustment, net of tax	(981)	1,344	(160)	(166)
Other comprehensive earnings	208	2,306	2,723	4,253
Comprehensive earnings	$ 8,325	$ 9,125	$ 22,281	$ 3,305

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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

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

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