Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Oct. 02, 2011	Jul. 03, 2011	Apr. 03, 2011	Dec. 31, 2010	Oct. 03, 2010	Jul. 04, 2010	Apr. 04, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Operations [Abstract]
Revenues	$ 464,361	$ 519,713	$ 536,251	$ 461,628	$ 425,176	$ 396,927	$ 410,563	$ 384,424	$ 1,981,953	$ 1,617,090	$ 1,362,016
Cost of sales									(1,410,134)	(1,149,796)	(974,331)
Gross profit	131,999	152,751	156,614	130,455	121,396	118,184	117,304	110,410	571,819	467,294	387,685
Selling, general and administrative expenses									(325,950)	(279,677)	(262,473)
Research and development									(55,711)	(42,605)	(40,441)
Amortization of intangibles									(13,772)	(11,189)	(9,871)
Income from equity method investment									13,169	11,940	6,405
Asset impairment	(2,500)				(16,600)				(2,549)	(16,574)	(27,751)
Loss on sale of assets											(17,184)
Operating income	34,858	51,863	58,212	42,073	16,698	41,586	39,610	31,295	187,006	129,189	36,370
Interest expense									(48,126)	(49,826)	(41,962)
Interest income									1,011	1,184	1,043
Other income (expense)										1,465	(1,541)
Income (loss) from continuing operations before taxes									139,891	82,012	(6,090)
Income tax expense									(24,638)	(12,714)	(1,175)
Income (loss) from continuing operations	26,989	31,365	34,881	22,018	10,739	22,644	21,585	14,330	115,253	69,298	(7,265)
Loss from discontinued operations, net of tax	(462)	(162)	(156)	(128)	849	(2,039)	(1,913)	(2,583)	(908)	(5,686)	(17,636)
Gain from disposal of discontinued operations, net of tax					44,847					44,847
Net income (loss)	$ 26,527	$ 31,203	$ 34,725	$ 21,890	$ 56,435	$ 20,605	$ 19,672	$ 11,747	$ 114,345	$ 108,459	$ (24,901)
Weighted average number of common shares and equivalents:
Basic									47,109	46,805	46,594
Diluted									48,104	47,783	46,594
Basic income (loss) per share:
Continuing operations	$ 0.58	$ 0.66	$ 0.73	$ 0.47	$ 0.23	$ 0.48	$ 0.46	$ 0.31	$ 2.45	$ 1.48	$ (0.16)
Discontinued operations	$ (0.01)			$ (0.01)	$ 0.02	$ (0.04)	$ (0.04)	$ (0.06)	$ (0.02)	$ (0.11)	$ (0.37)
Disposal of discontinued operations					$ 0.95					$ 0.95
Net income (loss)	$ 0.57	$ 0.66	$ 0.73	$ 0.46	$ 1.20	$ 0.44	$ 0.42	$ 0.25	$ 2.43	$ 2.32	$ (0.53)
Diluted income (loss) per share:
Continuing operations	$ 0.57	$ 0.65	$ 0.72	$ 0.46	$ 0.22	$ 0.47	$ 0.45	$ 0.30	$ 2.40	$ 1.45	$ (0.16)
Discontinued operations	$ (0.01)			$ (0.01)	$ 0.02	$ (0.04)	$ (0.04)	$ (0.05)	$ (0.02)	$ (0.11)	$ (0.37)
Disposal of discontinued operations					$ 0.93					$ 0.93
Net income (loss)	$ 0.56	$ 0.65	$ 0.72	$ 0.45	$ 1.17	$ 0.43	$ 0.41	$ 0.25	$ 2.38	$ 2.27	$ (0.53)