Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenues	$ 464,291	$ 461,628
Cost of sales	(322,573)	(331,173)
Gross profit	141,718	130,455
Selling, general and administrative expenses	(83,226)	(74,936)
Research and development	(14,033)	(13,629)
Amortization of intangibles	(3,235)	(3,679)
Income from equity method investment	2,741	3,862
Operating income	43,965	42,073
Interest expense	(11,921)	(11,808)
Interest income	351	159
Income from continuing operations before taxes	32,395	30,424
Income tax expense	(8,120)	(8,406)
Income from continuing operations	24,275	22,018
Loss from discontinued operations, net of tax		(128)
Net income	24,275	21,890
Weighted average number of common shares and equivalents:
Basic	45,912	47,209
Diluted	46,938	48,330
Basic income (loss) per share
Continuing operations	$ 0.53	$ 0.47
Discontinued operations		$ (0.01)
Net income	$ 0.53	$ 0.46
Diluted income (loss) per share
Continuing operations	$ 0.52	$ 0.46
Discontinued operations		$ (0.01)
Net income	$ 0.52	$ 0.45
Comprehensive income	$ 34,901	$ 44,647
Dividends declared per share	$ 0.05	$ 0.05