Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 199,181	$ 218,680
Short-term investments	108,043	105,054
Accounts receivable, net of allowances of $3,735 and $3,213, respectively	64,279	37,285
Prepaid expenses and other current assets	22,779	15,388
Deferred income taxes	2,729	1,092
Total current assets	397,011	377,499
Long-term investments	66,899	19,841
Property and equipment, net	30,143	19,599
Tradenames, net	84,419	71,409
Patent and patent licenses, net	18,703	19,329
Customer relationships, net	84,023	64,723
Goodwill	441,687	407,825
Other purchased intangibles, net	9,666	9,855
Deferred income taxes	2,130	1,852
Other assets	3,409	3,238
Total assets	1,138,090	995,170
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	68,430	39,874
Income taxes payable	1,736	3,004
Deferred revenue, current	35,675	30,493
Liability for uncertain tax positions	5,535	5,523
Deferred income taxes	5,098	33
Total current liabilities	116,474	78,927
Long-term Debt	245,548	245,194
Liability for uncertain tax positions	36,010	32,155
Deferred income taxes	41,635	32,393
Deferred revenue, non-current	12,041	1,609
Other long-term liabilities	1,787	1,557
Mandatorily redeemable financial instrument	9,760	8,740
Total liabilities	463,255	400,575
Commitments and contingencies	0	0
Preferred stock, $0.01 par value. Authorized 1,000,000 and none issued	0	0
Common stock, $0.01 par value. Authorized 95,000,000 at September 30, 2013 and December 31, 2012; total issued 45,858,238 and 45,094,191 shares at September 30, 2013 and December 31, 2012, respectively; and total outstanding 45,858,238 and 45,094,191 shares at September 30, 2013 and December 31, 2012, respectively	459	451
Additional paid-in capital	191,287	169,542
Retained Earnings (Accumulated Deficit)	475,979	424,790
Accumulated other comprehensive loss	8,646	(88)
Total stockholders' equity	676,371	594,695
Stockholders' Equity Attributable to Noncontrolling Interest	(1,536)	(100)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	674,835	594,595
Total liabilities and stockholders' equity	$ 1,138,090	$ 995,170