Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2014		Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Net revenue	$ 360,863	$ 341,893	$ 288,782	$ 309,157	$ 353,182		$ 353,338	$ 337,604	$ 349,391	$ 1,300,695	$ 1,393,515	$ 1,369,633
Gross Profit	105,416	96,327	77,656	88,280	100,474		102,333	97,186	97,925	367,679	397,918	393,615
Provision for income taxes	8,927	10,780	7,258	10,015	(5,609)		8,847	9,698	9,037	36,980	21,973	37,765
Net Income	$ 21,807	$ 15,099	$ 3,667	$ 8,011	$ (40,353)	[1]	$ 20,025	$ 14,705	$ 14,411	$ 48,584	$ 8,788	$ 55,217
Basic net income per share (in dollars per share)	$ 0.68	$ 0.47	$ 0.11	$ 0.23	$ (1.16)		$ 0.56	$ 0.41	$ 0.39	$ 1.47	$ 0.25	$ 1.44
Diluted net income per share (in dollars per share)	$ 0.66	$ 0.47	$ 0.11	$ 0.23	$ (1.16)		$ 0.55	$ 0.40	$ 0.39	$ 1.44	$ 0.24	$ 1.42

[1] Net loss includes a non-cash goodwill impairment charge of $74.2 million relating to the service provider business unit.