CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net revenues	$ 163,828	$ 145,626	$ 317,408	$ 280,705
Cost of net revenues	40,137	36,826	80,868	71,145
Gross profit	123,691	108,800	236,540	209,560
Operating expenses:
Sales and marketing	47,847	39,087	90,128	77,804
General and administrative	27,027	23,021	57,375	46,532
Research and development	10,916	10,680	22,198	21,206
Impairment of goodwill	0	0	40,693	0
Asset Impairment Charges	0	0	26,320	0
Total operating expenses	85,790	72,788	236,714	145,542
Profit from operations	37,901	36,012	(174)	64,018
Interest and other income (expense), net	(335)	541	(1,323)	(271)
Net profit before provision for income taxes	37,566	36,553	(1,497)	63,747
Provision for income taxes	8,246	8,061	11,166	14,271
Net profit (loss)	$ 29,320	$ 28,492	$ (12,663)	$ 49,476
Net profit (loss) per share:
Basic (in usd per share)	$ 0.36	$ 0.35	$ (0.16)	$ 0.62
Diluted (in usd per share)	$ 0.36	$ 0.34	$ (0.16)	$ 0.60
Shares used in computing net profit (loss) per share:
Basic (in shares)	80,576	80,384	80,909	79,810
Diluted (in shares)	82,149	82,954	80,909	82,446
Effective Income Tax Rate, Continuing Operations	22.00%	22.10%	(745.90%)	22.40%