Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 214,926	$ 218,680
Short-term investments	108,947	105,054
Accounts receivable, net of allowances of $2,983 and $3,213, respectively	62,270	37,285
Prepaid expenses and other current assets	16,828	15,388
Deferred income taxes	4,045	1,092
Total current assets	407,016	377,499
Long-term investments	29,002	19,841
Property and equipment, net	28,453	19,599
Tradenames, net	85,606	71,409
Patent and patent licenses, net	18,056	19,329
Customer relationships, net	84,490	64,723
Goodwill	433,940	407,825
Other purchased intangibles, net	10,514	9,855
Deferred income taxes	3,670	1,852
Other assets	3,132	3,238
Total assets	1,103,879	995,170
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	67,091	39,874
Income taxes payable	2,060	3,037
Deferred revenue, current	34,891	30,493
Liability for uncertain tax positions	5,532	5,523
Deferred income taxes	4,018	0
Total current liabilities	113,592	78,927
Long-term Debt	245,427	245,194
Liability for uncertain tax positions	35,657	32,155
Deferred income taxes	41,279	32,393
Deferred revenue, non-current	12,960	1,609
Other long-term liabilities	1,155	1,557
Mandatorily redeemable financial instrument	9,408	8,740
Total liabilities	459,478	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 June 30, 2013 and December 31, 2012; total issued 45,569,335 and 45,094,191 shares at June 30, 2013 and December 31, 2012, respectively; and total outstanding 45,569,335 and 45,094,191 shares at June 30, 2013 and December 31, 2012, respectively	456	451
Additional paid-in capital	181,274	169,542
Retained Earnings (Accumulated Deficit)	460,880	424,790
Accumulated other comprehensive loss	2,797	(88)
Total stockholders' equity	645,407	594,695
Stockholders' Equity Attributable to Noncontrolling Interest	(1,006)	(100)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	644,401	594,595
Total liabilities and stockholders' equity	$ 1,103,879	$ 995,170