Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 514,997		$ 207,801	$ 199,181	$ 218,680
Short-term investments	107,418		90,789
Accounts receivable, net of allowances of $3,582 and $4,105, respectively	75,016		67,245
Prepaid expenses and other current assets	24,817		20,064
Deferred income taxes	7,451		3,126
Total current assets	729,699		389,025
Long-term investments	61,415		47,351
Property and equipment, net	38,787		31,200
Tradenames, net	84,193		83,108
Patent and patent licenses, net	26,892		28,530
Customer relationships, net	144,398		100,980
Goodwill	533,403		457,422
Other purchased intangibles, net	8,021		10,915
Deferred income taxes	0		1,845
Other assets	13,196		3,413
Total assets	1,640,004		1,153,789
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	70,781		69,570
Income taxes payable	1,187		1,569
Deferred revenue, current	57,399		36,326
Liability for uncertain tax positions	0		5,535
Deferred income taxes	591		1,892
Other current liabilities	540		0
Total current liabilities	130,498		114,892
Long-term Debt	591,464		245,670
Liability for uncertain tax positions	35,793		38,329
Deferred income taxes	61,710		35,833
Deferred revenue, non-current	10,945		11,189
Other long-term liabilities	6,033		1,458
Total liabilities	836,443		447,371
Commitments and contingencies	0		0
Common stock, $0.01 par value. Authorized 95,000,000; total issued and outstanding 46,892,811 and 46,105,076 shares, respectively	469		461
Additional paid-in capital	270,857		216,872
Retained Earnings (Accumulated Deficit)	535,567		484,850
Accumulated other comprehensive loss	(3,332)	6,651	4,235
Stockholders' Equity Attributable to Noncontrolling Interest			0
Total stockholders' equity	803,561		706,418
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	803,561		706,418
Total liabilities and stockholders' equity	1,640,004		1,153,789
Series A Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value	0		0
Series B Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value	$ 0		$ 0