Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Net income (loss)	$ (12,589)	$ 4,387	$ (20,535)	$ 9,516
Foreign currency translation adjustment
Foreign currency translation gains (losses)	798	(1,035)	(140)	(1,611)
Pension and postretirement benefit liabilities:
Reclassification adjustment for unrecognized prior service costs and unrecognized loss included in net income (loss)	36	117	83	250
Total	(1,514)	117	(1,467)	250
Comprehensive income (loss)	(13,305)us-gaap_ComprehensiveIncomeNetOfTax	3,469us-gaap_ComprehensiveIncomeNetOfTax	(22,142)us-gaap_ComprehensiveIncomeNetOfTax	8,155us-gaap_ComprehensiveIncomeNetOfTax
Previously reported
Net income (loss)		4,158		9,228
Foreign currency translation adjustment
Foreign currency translation gains (losses)		(1,020)		(1,597)
Pension and postretirement benefit liabilities:
Reclassification adjustment for unrecognized prior service costs and unrecognized loss included in net income (loss)		117		250
Total		117		250
Comprehensive income (loss)		3,255		7,881
Adjustments
Net income (loss)		229		288
Foreign currency translation adjustment
Foreign currency translation gains (losses)		(15)		(14)
Pension and postretirement benefit liabilities:
Comprehensive income (loss)		$ 214		$ 274

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.

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

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