Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 15,993	$ 33,847	$ 15	$ 24,594	$ 22,508	$ 29,068	$ 29,492	$ 22,245	$ 74,449	$ 103,313	$ 194,490
Foreign currency translation, net of tax of $1.8 million, $2.2 million, and $0.0 million, respectively									(10,387)	(20,720)	(1,414)
Foreign currency hedging instruments, net of tax of $0.0 million, $0.0 million, and $1.6 million, respectively											2,467
Adjustments to pension and postretirement liability, net of tax of $3.6 million, $14.0 million, and $3.2 million, respectively									(6,463)	22,104	(8,909)
Net current period other comprehensive income (loss)									(16,850)	1,384	(7,856)
Comprehensive income									$ 57,599	$ 104,697	$ 186,634