Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net revenue	$ 1,406,920	$ 1,328,298	$ 1,300,695
Cost of revenue	1,010,878	916,113	933,016
Gross profit	396,042	412,185	367,679
Operating expenses:
Research and development	94,603	89,367	86,499
Sales and marketing	158,168	150,355	146,794
General and administrative	56,421	54,482	45,313
Restructuring and other charges	97	3,881	6,398
Litigation reserves, net	176	73	(2,682)
Total operating expenses	309,465	298,158	282,322
Income from operations	86,577	114,027	85,357
Interest income	2,113	1,163	295
Other income (expense), net	2,024	(121)	(88)
Income before income taxes	90,714	115,069	85,564
Provision for income taxes	71,278	39,218	36,980
Net Income	$ 19,436	$ 75,851	$ 48,584
Net income per share:
Basic net income per share (in dollars per share)	$ 0.61	$ 2.32	$ 1.47
Diluted net income per share (in dollars per share)	$ 0.59	$ 2.25	$ 1.44
Weighted average shares outstanding used to compute net income per share:
Basic (in shares)	32,097	32,758	33,161
Diluted (in shares)	33,044	33,728	33,788