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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisitions (Allocation of Total Purchase Prices) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	May. 18, 2015	Jan. 08, 2015	Dec. 31, 2014	Dec. 31, 2013
Purchase Price Allocation
Goodwill	$ 1,962,722			$ 1,796,851	$ 1,768,949
Sanbolic, Inc. [Member]
Purchase Price Allocation
Current assets			$ 581
Property and equipment			0
Intangible assets			45,300
Goodwill			61,641
Other assets			0
Assets acquired			107,522
Current liabilities assumed			1,454
Long-term liabilities assumed			3,175
Deferred tax liabilities, non-current			13,297
Net assets acquired			$ 89,596
Grasshopper Group, LLC [Member]
Purchase Price Allocation
Current assets		$ 4,818
Property and equipment		467
Intangible assets		71,400
Goodwill		99,686
Other assets		80
Assets acquired		176,451
Current liabilities assumed		11,181
Long-term liabilities assumed		158
Deferred tax liabilities, non-current		0
Net assets acquired		$ 165,112
Other 2015 Acquisition [Member]
Purchase Price Allocation
Current assets	205
Property and equipment	0
Intangible assets	980
Goodwill	5,285
Other assets	0
Assets acquired	6,470
Current liabilities assumed	42
Long-term liabilities assumed	0
Deferred tax liabilities, non-current	306
Net assets acquired	$ 6,122
Finite-lived intangible assets acquired, Asset Life	5 years
Core and product technologies \| Sanbolic, Inc. [Member]
Purchase Price Allocation
Intangible assets	$ 43,800
Core and product technologies \| Sanbolic, Inc. [Member] \| Minimum
Purchase Price Allocation
Finite-lived intangible assets acquired, Asset Life	5 years
Core and product technologies \| Sanbolic, Inc. [Member] \| Maximum
Purchase Price Allocation
Finite-lived intangible assets acquired, Asset Life	6 years
Core and product technologies \| Grasshopper Group, LLC [Member]
Purchase Price Allocation
Intangible assets	$ 25,000
Finite-lived intangible assets acquired, Asset Life	7 years
Core and product technologies \| Other 2015 Acquisition [Member]
Purchase Price Allocation
Intangible assets	$ 980
Finite-lived intangible assets acquired, Asset Life	5 years