Unrestricted Subsidiaries Unrestricted Subsidiaries (Financial Position) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 514,997		$ 207,801	$ 199,181	$ 218,680
Accounts receivable	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
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
Accounts payable and accrued expenses	70,781		69,570
Income taxes payable	1,187		1,569
Deferred revenue, current	57,399		36,326
Deferred Tax Liabilities, Net, Current	591		1,892
Total current liabilities	130,498		114,892
Deferred income taxes	61,710		35,833
Other long-term liabilities	6,033		1,458
Total liabilities	836,443		447,371
Commitments and contingencies	0		0
Common Stock, Value, Issued	469		461
Additional paid-in capital	270,857		216,872
Retained Earnings (Accumulated Deficit)	535,567		484,850
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,332)	6,651	4,235
Stockholders' Equity Attributable to Parent	803,561		706,418
Total liabilities and stockholders’ equity	1,640,004		1,153,789
Unrestricted Subsidiaries [Member]
Cash and cash equivalents	28,093
Accounts receivable	47,081
Prepaid expenses and other current assets	3,570
Deferred income taxes	9,289
Total current assets	88,033
Property and equipment, net	12,737
Tradenames, net	50,156
Patent and patent licenses, net		25,904
Customer Relationships, Net	49,885
Goodwill	148,080
Other purchased intangibles, net	802
Deferred income taxes	1,280
Other assets	1,707
Total assets	378,584
Accounts payable and accrued expenses	36,700
Income taxes payable	249
Deferred revenue, current	4,044
Deferred Tax Liabilities, Net, Current	0
Total current liabilities	40,993
Deferred income taxes	25,238
Other long-term liabilities	1,541
Total liabilities	67,772
Additional paid-in capital	316,124
Retained Earnings (Accumulated Deficit)	(5,306)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(6)
Stockholders' Equity Attributable to Parent	310,812
Total liabilities and stockholders’ equity	$ 378,584