Guarantor Financial Information (Condensed Consolidated Statements of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Net sales	$ 452,732	$ 455,875	$ 1,276,514	$ 1,366,383
Costs and expenses:
Cost of sales and operating expenses	327,909	326,882	918,516	953,437
Selling, general and administrative expenses	38,523	35,487	112,786	100,272
Depreciation and amortization	20,524	18,953	62,958	57,689
Total costs and expenses	386,956	381,322	1,094,260	1,111,398
Operating income	65,776	74,553	182,254	254,985
Interest expense	(5,868)	(7,409)	(18,546)	(29,382)
Other income/(expense), net	232	(833)	(106)	(2,293)
Equity in net loss of unconsolidated subsidiary	(833)	(170)	(1,725)	(1,344)
Earnings in investments in subsidiaries	0	0	0	0
Income before income taxes	59,307	66,141	161,877	221,966
Income taxes (Benefit)	22,135	25,009	59,909	82,045
Net income (loss)	37,172	41,132	101,968	139,921
Issuer [Member]
Net sales	165,256	178,895	502,814	537,154
Costs and expenses:
Cost of sales and operating expenses	125,806	139,946	389,808	407,157
Selling, general and administrative expenses	20,396	18,322	60,108	51,033
Depreciation and amortization	5,502	5,336	17,614	17,091
Total costs and expenses	151,704	163,604	467,530	475,281
Operating income	13,552	15,291	35,284	61,873
Interest expense	(5,867)	(7,408)	(18,544)	(29,380)
Other income/(expense), net	(841)	(798)	(2,071)	(2,072)
Equity in net loss of unconsolidated subsidiary	0	0	0	0
Earnings in investments in subsidiaries	32,877	36,750	92,728	120,745
Income before income taxes	39,721	43,835	107,397	151,166
Income taxes (Benefit)	2,549	2,703	5,429	11,245
Net income (loss)	37,172	41,132	101,968	139,921
Guarantors [Member]
Net sales	330,013	312,914	903,712	947,271
Costs and expenses:
Cost of sales and operating expenses	244,924	223,127	659,207	665,065
Selling, general and administrative expenses	18,093	17,124	52,571	49,117
Depreciation and amortization	15,016	13,611	45,327	40,581
Total costs and expenses	278,033	253,862	757,105	754,763
Operating income	51,980	59,052	146,607	192,508
Interest expense	(1)	(1)	(2)	(2)
Other income/(expense), net	1,076	(13)	1,981	(294)
Equity in net loss of unconsolidated subsidiary	0	0	0	0
Earnings in investments in subsidiaries	0	0	0	0
Income before income taxes	53,055	59,038	148,586	192,212
Income taxes (Benefit)	19,806	22,302	54,990	71,047
Net income (loss)	33,249	36,736	93,596	121,165
Non-guarantors [Member]
Net sales	3,814	9,707	10,089	20,939
Costs and expenses:
Cost of sales and operating expenses	3,530	9,450	9,602	20,196
Selling, general and administrative expenses	34	41	107	122
Depreciation and amortization	6	6	17	17
Total costs and expenses	3,570	9,497	9,726	20,335
Operating income	244	210	363	604
Interest expense	0	0	0	0
Other income/(expense), net	(3)	(22)	(16)	73
Equity in net loss of unconsolidated subsidiary	(833)	(170)	(1,725)	(1,344)
Earnings in investments in subsidiaries	0	0	0	0
Income before income taxes	(592)	18	(1,378)	(667)
Income taxes (Benefit)	(220)	4	(510)	(247)
Net income (loss)	(372)	14	(868)	(420)
Eliminations [Member]
Net sales	(46,351)	(45,641)	(140,101)	(138,981)
Costs and expenses:
Cost of sales and operating expenses	(46,351)	(45,641)	(140,101)	(138,981)
Selling, general and administrative expenses	0	0	0	0
Depreciation and amortization	0	0	0	0
Total costs and expenses	(46,351)	(45,641)	(140,101)	(138,981)
Operating income	0	0	0	0
Interest expense	0	0	0	0
Other income/(expense), net	0	0	0	0
Equity in net loss of unconsolidated subsidiary	0	0	0	0
Earnings in investments in subsidiaries	(32,877)	(36,750)	(92,728)	(120,745)
Income before income taxes	(32,877)	(36,750)	(92,728)	(120,745)
Income taxes (Benefit)	0	0	0	0
Net income (loss)	$ (32,877)	$ (36,750)	$ (92,728)	$ (120,745)