Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 28, 2014		Jun. 29, 2013		Jun. 28, 2014		Jun. 29, 2013
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance					$ (10,819)		$ (42,623)
Other comprehensive income (loss) before reclassifications					1,636		(2,499)
Amounts reclassified from AOCI					454		(1,253)
Net current-period other comprehensive income					2,090		(3,752)
Ending balance	(8,729)		(46,375)		(8,729)		(46,375)
Reclassification adjustments out of AOCI [Abstract]
Cost of goods sold	(557,775)		(501,125)		(1,053,552)		(983,975)
Net of tax and noncontrolling interest	(360)	[1]	2,198	[2]	(1,476)	[3]	474	[4]
Selling, general, and administrative expense	(35,120)		(34,814)		(67,303)		(66,157)
Cumulative Translation Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance					(462)		(3,033)
Other comprehensive income (loss) before reclassifications					3,711		(6,470)
Amounts reclassified from AOCI					0		0
Net current-period other comprehensive income					3,711		(6,470)
Ending balance	3,249		(9,503)		3,249		(9,503)
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					(1,698)		2,995
Amounts reclassified from AOCI					222		(2,521)
Net current-period other comprehensive income					(1,476)		474
Ending balance	70		308		70		308
Unrealized Losses/(Gains) on Derivatives [Member] | Amount Reclassified from AOCI [Member]
Reclassification adjustments out of AOCI [Abstract]
Cost of goods sold	208		3,967		565		3,876
Property, plant and equipment, net	(99)		0		(375)		0
Income tax benefit	(4)		(1,371)		32		(1,355)
Net of tax	105		2,596		222		2,521
Noncontrolling interest	0		0		0		0
Net of tax and noncontrolling interest	105		2,596		222		2,521
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					(388)		893
Amounts reclassified from AOCI					232		1,268
Net current-period other comprehensive income					(156)		2,161
Ending balance	(12,314)		(37,366)		(12,314)		(37,366)
Minimum Pension/OPEB Liability Adjustment [Member] | Amount Reclassified from AOCI [Member]
Reclassification adjustments out of AOCI [Abstract]
Selling, general, and administrative expense	143		921		267		1,889
Income tax expense	(22)		(302)		(35)		(621)
Net of tax	121		619		232		1,268
Noncontrolling interest	0		0		0		0
Net of tax and noncontrolling interest	121		619		232		1,268
Unrealized Gains on Equity Investments [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance					255		103
Other comprehensive income (loss) before reclassifications					9		83
Amounts reclassified from AOCI					0		0
Net current-period other comprehensive income					9		83
Ending balance	$ 264		$ 186		$ 264		$ 186

[1] Net of tax of $275

[2] Net of tax of $(1,308)

[3] Net of tax of $865

[4] Net of tax of $(328)