Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 27, 2014		Sep. 28, 2013		Sep. 27, 2014		Sep. 28, 2013
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance					$ (10,819)		$ (42,623)
Other comprehensive income (loss) before reclassifications					(4,839)		4,709
Amounts reclassified from AOCI					349		(1,413)
Net current-period other comprehensive income					(4,490)		3,296
Ending balance	(15,309)		(39,327)		(15,309)		(39,327)
Reclassification adjustments out of AOCI [Abstract]
Cost of goods sold	(521,278)		(456,302)		(1,574,830)		(1,440,277)
Net of tax and noncontrolling interest	(174)	[1]	531	[2]	(1,650)	[3]	1,005	[4]
Selling, general, and administrative expense	(34,864)		(32,921)		(102,167)		(99,078)
Cumulative Translation Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance					(462)		(3,033)
Other comprehensive income (loss) before reclassifications					(3,337)		211
Amounts reclassified from AOCI					0		0
Net current-period other comprehensive income					(3,337)		211
Ending balance	(3,799)		(2,822)		(3,799)		(2,822)
Unrealized Losses/(Gains) on Derivatives [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance					1,546		(166)
Other comprehensive income (loss) before reclassifications					(1,652)		4,314
Amounts reclassified from AOCI					2		(3,309)
Net current-period other comprehensive income					(1,650)		1,005
Ending balance	(104)		839		(104)		839
Unrealized Losses/(Gains) on Derivatives [Member] | Amount Reclassified from AOCI [Member]
Reclassification adjustments out of AOCI [Abstract]
Cost of goods sold	(214)		1,046		351		4,922
Property, plant and equipment, net	(71)		0		(446)		0
Income tax benefit (expense)	65		(258)		97		(1,613)
Net of tax	(220)		788		2		3,309
Noncontrolling interest	0		0		0		0
Net of tax and noncontrolling interest	(220)		788		2		3,309
Minimum Pension/OPEB Liability Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance					(12,158)		(39,527)
Other comprehensive income (loss) before reclassifications					143		79
Amounts reclassified from AOCI					347		1,896
Net current-period other comprehensive income					490		1,975
Ending balance	(11,668)		(37,552)		(11,668)		(37,552)
Minimum Pension/OPEB Liability Adjustment [Member] | Amount Reclassified from AOCI [Member]
Reclassification adjustments out of AOCI [Abstract]
Selling, general, and administrative expense	134		946		401		2,835
Income tax expense	(19)		(318)		(54)		(939)
Net of tax	115		628		347		1,896
Noncontrolling interest	0		0		0		0
Net of tax and noncontrolling interest	115		628		347		1,896
Unrealized Gains on Equity Investments [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance					255		103
Other comprehensive income (loss) before reclassifications					7		105
Amounts reclassified from AOCI					0		0
Net current-period other comprehensive income					7		105
Ending balance	$ 262		$ 208		$ 262		$ 208

[1] Net of tax of $42

[2] Net of tax of $(280)

[3] Net of tax of $907

[4] Net of tax of $(607)