CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Income Statement [Abstract]
Revenues	$ 610,774	$ 522,478	$ 1,699,355	$ 1,559,442
Cost of sales	(389,042)	(339,637)	(1,097,521)	(1,030,052)
Gross profit	221,732	182,841	601,834	529,390
Selling, general and administrative expenses	(119,104)	(96,197)	(359,854)	(281,682)
Research and development	(30,444)	(21,141)	(82,633)	(62,497)
Amortization of intangibles	(15,203)	(12,326)	(42,739)	(38,408)
Income from equity method investment	1,030	758	3,240	5,285
Operating income	58,011	53,935	119,848	152,088
Interest expense	(21,656)	(19,259)	(58,679)	(53,509)
Interest income	159	92	420	349
Income from continuing operations before taxes	36,514	34,768	61,589	98,928
Income tax expense	(2,667)	(5,700)	(2,571)	(18,123)
Income from continuing operations	33,847	29,068	59,018	80,805
Loss from disposal of discontinued operations, net of tax			(562)
Net income	33,847	29,068	58,456	80,805
Weighted average number of common shares and equivalents:
Basic	43,201	43,694	43,439	44,013
Diluted	43,910	44,537	44,164	44,916
Basic income (loss) per share:
Continuing operations	$ 0.78	$ 0.67	$ 1.36	$ 1.84
Discontinued operations			$ (0.01)
Net income	$ 0.78	$ 0.67	$ 1.35	$ 1.84
Diluted income (loss) per share:
Continuing operations	$ 0.77	$ 0.65	$ 1.33	$ 1.80
Discontinued operations			$ (0.01)
Net income	$ 0.77	$ 0.65	$ 1.32	$ 1.80
Comprehensive income	$ 30,783	$ 34,776	$ 57,958	$ 73,618
Dividends declared per share	$ 0.05	$ 0.05	$ 0.15	$ 0.15