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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Sep. 29, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 10,857	$ 4,387	$ 5,129	$ 9,516	$ 20,373	$ 22,867	$ (6,858)	$ 4,988
Foreign currency translation adjustment:
Foreign currency translation gains (losses)						(1,889)	517	(444)
Pension and postretirement benefit liabilities:
Other comprehensive income (loss) arising during the period						5,890	(2,322)	(5,765)
Reclassification adjustment for unrecognized prior service costs and unrecognized loss included in net income (loss)						501	1,093	563
Total						6,391	(1,229)	(5,202)
Comprehensive income (loss)						$ 27,369us-gaap_ComprehensiveIncomeNetOfTax	$ (7,570)us-gaap_ComprehensiveIncomeNetOfTax	$ (658)us-gaap_ComprehensiveIncomeNetOfTax