Unrestricted Subsidiaries Unrestricted Subsidiaries (Financial Position) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 591,881		$ 207,801	$ 214,926	$ 218,680
Accounts Receivable, Net, Current	70,830		67,245
Prepaid expenses and other current assets	33,841		20,064
Deferred income taxes	3,232		3,126
Assets, Current	761,471		389,025
Property and equipment, net	40,662		31,200
Tradenames, net	82,045		83,108
Patent and patent licenses, net	28,257		28,530
Customer Relationships, Net	133,629		100,980
Goodwill	514,539		457,422
Other purchased intangibles, net	10,902		10,915
Deferred income taxes	0		1,845
Other assets	13,378		3,413
Assets	1,639,817		1,153,789
Accounts payable and accrued expenses	65,586		69,570
Income taxes payable	4,727		1,569
Deferred revenue, current	57,315		36,326
Deferred Tax Liabilities, Net, Current	1,683		1,892
Liabilities, Current	130,220		114,892
Deferred income taxes	66,095		35,833
Other long-term liabilities	5,915		1,458
Liabilities	846,225		447,371
Commitments and contingencies	0		0
Common Stock, Value, Issued	468		461
Additional paid-in capital	266,122		216,872
Retained Earnings (Accumulated Deficit)	520,351		484,850
Accumulated Other Comprehensive Income (Loss), Net of Tax	6,651	2,432	4,235
Stockholders' Equity Attributable to Parent	793,592		706,418
Liabilities and Equity	1,639,817		1,153,789
Unrestricted Subsidiaries [Member]
Cash and cash equivalents	19,902
Accounts Receivable, Net, Current	47,528
Prepaid expenses and other current assets	2,723
Deferred income taxes	4,187
Assets, Current	74,340
Property and equipment, net	13,070
Tradenames, net	49,128
Patent and patent licenses, net		19,295
Customer Relationships, Net	52,705
Goodwill	148,301
Other purchased intangibles, net	3,244
Deferred income taxes	196
Other assets	1,741
Assets	362,020
Accounts payable and accrued expenses	14,391
Income taxes payable	7,731
Deferred revenue, current	4,527
Deferred Tax Liabilities, Net, Current	0
Liabilities, Current	26,649
Deferred income taxes	23,799
Other long-term liabilities	1,409
Liabilities	51,857
Additional paid-in capital	316,300
Retained Earnings (Accumulated Deficit)	(6,086)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(51)
Stockholders' Equity Attributable to Parent	310,163
Liabilities and Equity	$ 362,020