CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net revenues	[1]	$ 209,488	$ 192,531	$ 407,574	$ 373,177
Cost of net revenues		50,854	47,055	97,850	90,450
Gross profit		158,634	145,476	309,724	282,727
Operating expenses:
Selling, general and administrative		100,625	83,455	188,906	165,522
Research and development		15,684	13,289	29,569	26,669
Total operating expenses		116,309	96,744	218,475	192,191
Income from operations		42,325	48,732	91,249	90,536
Interest and other income (expenses), net		174	(93)	(1,278)	508
Net income before provision for income taxes		42,499	48,639	89,971	91,044
Provision for income taxes		11,149	13,039	22,444	23,000
Net income		$ 31,350	$ 35,600	$ 67,527	$ 68,044
Net income per share:
Basic (in usd per share)		$ 0.39	$ 0.44	$ 0.84	$ 0.84
Diluted (in usd per share)		$ 0.39	$ 0.43	$ 0.83	$ 0.82
Shares used in computing net income per share:
Basic (in shares)		80,257	81,027	80,358	81,073
Diluted (in shares)		81,394	82,341	81,729	82,651

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