Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Revenue	$ 213,813		$ 196,519		$ 218,840
Cost of revenue (1)	100,665	[1]	94,925	[1]	97,383
Gross profit	113,148		101,594		121,457
Research and development (2)	48,796	[2]	44,518	[2]	44,372
Selling, general and administrative (3)	50,018	[3]	40,280	[3]	41,169
Litigation expense (benefit), net	(2,945)		3,379		5,418
Total operating expenses	95,869		88,177		90,959
Income from operations	17,279		13,417		30,498
Interest income and other, net	611		309		922
Income before income taxes	17,890		13,726		31,420
Income tax provision	2,134		425		1,857
Net income	15,756		13,301		29,563
Basic net income per share (in Dollars per share)	$ 0.45		$ 0.39		$ 0.83
Diluted net income per share (in Dollars per share)	$ 0.43		$ 0.38		$ 0.78
Basic (in Shares)	34,871		34,050		35,830
Diluted (in Shares)	36,247		35,160		37,826
(1) Includes stock-based compensation expense	18,652		13,126		16,810
(2) Includes stock-based compensation expense	18,652		13,126		16,810
(3) Includes stock-based compensation expense	18,652		13,126		16,810
Total stock-based compensation expense	18,652		13,126		16,810
Cost Of Revenue [Member]
(1) Includes stock-based compensation expense	510		312		393
(2) Includes stock-based compensation expense	510		312		393
(3) Includes stock-based compensation expense	510		312		393
Total stock-based compensation expense	510		312		393
Research and Development Expense [Member]
(1) Includes stock-based compensation expense	6,922		5,909		6,742
(2) Includes stock-based compensation expense	6,922		5,909		6,742
(3) Includes stock-based compensation expense	6,922		5,909		6,742
Total stock-based compensation expense	6,922		5,909		6,742
Selling, General and Administrative Expenses [Member]
(1) Includes stock-based compensation expense	11,220		6,905		9,675
(2) Includes stock-based compensation expense	11,220		6,905		9,675
(3) Includes stock-based compensation expense	11,220		6,905		9,675
Total stock-based compensation expense	$ 11,220		$ 6,905		$ 9,675

[1] (1) Includes stock-based compensation expense

[2] (2) Includes stock-based compensation expense

[3] (3) Includes stock-based compensation expense