Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Income Statement [Abstract]
Revenues	$ 579,266	$ 610,774	$ 1,711,978	$ 1,699,355
Cost of sales	(353,135)	(389,042)	(1,043,922)	(1,097,521)
Gross profit	226,131	221,732	668,056	601,834
Selling, general and administrative expenses	(128,140)	(119,104)	(396,883)	(359,854)
Research and development	(38,168)	(30,444)	(110,999)	(82,633)
Amortization of intangibles	(25,669)	(15,203)	(78,090)	(42,739)
Income from equity method investment	348	1,030	1,459	3,240
Operating income	34,502	58,011	83,543	119,848
Interest expense, net	(25,416)	(21,497)	(74,031)	(58,259)
Income from continuing operations before taxes	9,086	36,514	9,512	61,589
Income tax benefit (expense)	5,725	(2,667)	7,340	(2,571)
Income from continuing operations	14,811	33,847	16,852	59,018
Loss from discontinued operations, net of tax	(242)		(242)
Loss from disposal of discontinued operations, net of tax			(86)	(562)
Net income	$ 14,569	$ 33,847	$ 16,524	$ 58,456
Weighted average number of common shares and equivalents:
Basic	42,417	43,201	42,536	43,439
Diluted	42,908	43,910	43,117	44,164
Basic income (loss) per share:
Continuing operations	$ 0.35	$ 0.78	$ 0.40	$ 1.36
Discontinued operations	(0.01)		(0.01)
Disposal of discontinued operations				(0.01)
Net income	0.34	0.78	0.39	1.35
Diluted income (loss) per share:
Continuing operations	0.35	0.77	0.39	1.33
Discontinued operations	(0.01)		(0.01)
Disposal of discontinued operations				(0.01)
Net income	$ 0.34	$ 0.77	$ 0.38	$ 1.32
Comprehensive income (loss)	$ (9,803)	$ 30,783	$ 4,036	$ 57,958
Dividends declared per share	$ 0.05	$ 0.05	$ 0.15	$ 0.15