Supplemental Guarantor Information (Details 1) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Supplemental Condensed Consolidating Statements of Operations
Revenues	$ 536,251	$ 410,563	$ 997,879	$ 794,987
Cost of sales	(379,637)	(293,259)	(710,810)	(567,273)
Gross profit	156,614	117,304	287,069	227,714
Selling, general and administrative expenses	(84,380)	(68,407)	(159,316)	(137,142)
Research and development	(14,530)	(9,911)	(28,159)	(20,219)
Amortization of intangibles	(3,347)	(2,587)	(7,026)	(5,300)
Income from equity method investment	3,855	3,211	7,717	5,852
Operating income	58,212	39,610	100,285	70,905
Interest expense	(12,748)	(14,186)	(24,556)	(27,132)
Interest income	156	136	315	318
Other income	0	1,465	0	1,465
Income (loss) from continuing operations before taxes	45,620	27,025	76,044	45,556
Income tax benefit (expense)	(10,739)	(5,440)	(19,145)	(9,641)
Income (loss) from continuing operations	34,881	21,585	56,899	35,915
Loss from discontinued operations, net of tax	(156)	(1,913)	(284)	(4,496)
Net income (loss)	34,725	19,672	56,615	31,419
Issuer [Member]
Supplemental Condensed Consolidating Statements of Operations
Revenues	281,225	204,261	521,349	396,702
Cost of sales	(212,163)	(146,720)	(388,902)	(284,086)
Gross profit	69,062	57,541	132,447	112,616
Selling, general and administrative expenses	(44,251)	(38,111)	(83,818)	(74,935)
Research and development	(2,840)	(2,603)	(5,650)	(5,286)
Amortization of intangibles	(820)	(727)	(1,640)	(1,465)
Operating income	21,151	16,100	41,339	30,930
Interest expense	(12,162)	(14,443)	(23,944)	(27,225)
Interest income	29	30	72	79
Intercompany income (expense)	(13,004)	(1,009)	(14,686)	(306)
Income (loss) from equity investment in subsidiaries	39,679	20,834	55,653	32,279
Income (loss) from continuing operations before taxes	35,693	21,512	58,434	35,757
Income tax benefit (expense)	(812)	73	(1,535)	158
Income (loss) from continuing operations	34,881	21,585	56,899	35,915
Loss from discontinued operations, net of tax	(156)	(1,913)	(284)	(4,496)
Net income (loss)	34,725	19,672	56,615	31,419
Non-Guarantor Subsidiaries [Member]
Supplemental Condensed Consolidating Statements of Operations
Revenues	302,918	243,812	571,565	473,498
Cost of sales	(215,366)	(184,049)	(416,943)	(358,400)
Gross profit	87,552	59,763	154,622	115,098
Selling, general and administrative expenses	(40,129)	(30,296)	(75,498)	(62,207)
Research and development	(11,690)	(7,308)	(22,509)	(14,933)
Amortization of intangibles	(2,527)	(1,860)	(5,386)	(3,835)
Income from equity method investment	3,855	3,211	7,717	5,852
Operating income	37,061	23,510	58,946	39,975
Interest expense	(586)	257	(612)	93
Interest income	127	106	243	239
Other income		1,465		1,465
Intercompany income (expense)	13,004	1,009	14,686	306
Income (loss) from continuing operations before taxes	49,606	26,347	73,263	42,078
Income tax benefit (expense)	(9,927)	(5,513)	(17,610)	(9,799)
Income (loss) from continuing operations	39,679	20,834	55,653	32,279
Net income (loss)	39,679	20,834	55,653	32,279
Eliminations [Member]
Supplemental Condensed Consolidating Statements of Operations
Revenues	(47,892)	(37,510)	(95,035)	(75,213)
Cost of sales	47,892	37,510	95,035	75,213
Income (loss) from equity investment in subsidiaries	(39,679)	(20,834)	(55,653)	(32,279)
Income (loss) from continuing operations before taxes	(39,679)	(20,834)	(55,653)	(32,279)
Income (loss) from continuing operations	(39,679)	(20,834)	(55,653)	(32,279)
Net income (loss)	$ (39,679)	$ (20,834)	$ (55,653)	$ (32,279)