CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenues	$ 600,891	$ 529,491	$ 1,088,581	$ 1,036,964
Cost of sales	(396,506)	(350,295)	(708,479)	(690,415)
Gross profit	204,385	179,196	380,102	346,549
Selling, general and administrative expenses	(145,902)	(93,503)	(240,750)	(185,485)
Research and development	(31,618)	(20,931)	(52,189)	(41,356)
Amortization of intangibles	(15,795)	(13,105)	(27,536)	(26,082)
Income from equity method investment	1,256	2,256	2,210	4,527
Operating income	12,326	53,913	61,837	98,153
Interest expense	(18,203)	(18,345)	(37,023)	(34,250)
Interest income	111	149	261	257
Income (loss) from continuing operations before taxes	(5,766)	35,717	25,075	64,160
Income tax benefit (expense)	5,781	(6,225)	96	(12,423)
Income from continuing operations	15	29,492	25,171	51,737
Loss from disposal of discontinued operations, net of tax			(562)
Net income	15	29,492	24,609	51,737
Weighted average number of common shares and equivalents:
Basic	43,603	43,928	43,559	44,173
Diluted	44,292	44,790	44,293	45,107
Basic income (loss) per share:
Continuing operations		$ 0.67	$ 0.58	$ 1.17
Discontinued operations			$ (0.01)
Net income		$ 0.67	$ 0.57	$ 1.17
Diluted income (loss) per share:
Continuing operations		$ 0.66	$ 0.57	$ 1.15
Discontinued operations			$ (0.01)
Net income		$ 0.66	$ 0.56	$ 1.15
Comprehensive income	$ 13,894	$ 23,950	$ 27,175	$ 38,842
Dividends declared per share	$ 0.05	$ 0.05	$ 0.10	$ 0.10