CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Income Statement [Abstract]
Net revenues	$ 198,086	[1]	$ 180,646	[1]
Cost of net revenues	46,996		43,395
Gross profit	151,090		137,251
Operating expenses:
Selling, general and administrative	88,281		82,067
Research and development	13,885		13,380
Total operating expenses	102,166		95,447
Income from operations	48,924		41,804
Interest and other income (expenses), net	(1,452)		601
Net income before provision for income taxes	47,472		42,405
Provision for income taxes	11,295		9,961
Net income	$ 36,177		$ 32,444
Net income per share:
Basic (in usd per share)	$ 0.45		$ 0.40
Diluted (in usd per share)	$ 0.44		$ 0.39
Shares used in computing net income per share:
Basic (in shares)	80,459		81,120
Diluted (in shares)	81,824		82,817

[1] Net revenues are attributed to countries based on location of where revenue is recognized.