Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands		Feb. 19, 2016	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 1,597,423	$ 1,507,093
Connectifier [Member]
Business Acquisition [Line Items]
Net tangible assets		$ 7,098
Goodwill	[1]	90,120
Intangible assets	[2]	8,300
Total purchase price	[3]	105,518
Other Acquisition [Member]
Business Acquisition [Line Items]
Net tangible assets			0
Goodwill	[1]		245
Intangible assets	[2]		105
Total purchase price	[3]		350
Total Acquisitions [Member]
Business Acquisition [Line Items]
Net tangible assets			7,098
Goodwill	[1]		90,365
Intangible assets	[2]		8,405
Total purchase price	[3]		$ 105,868
Developed technology [Member] | Connectifier [Member]
Business Acquisition [Line Items]
Intangible assets acquired		$ 8,000
Intangible assets, estimated useful life		2 years
Customer relationships [Member] | Connectifier [Member]
Business Acquisition [Line Items]
Intangible assets acquired		$ 400
Intangible assets, estimated useful life		1 year

[1] The goodwill represents the excess value of the purchase price over both tangible and intangible assets acquired. The goodwill in these transactions is primarily attributable to expected operational synergies, the assembled workforce, and the future development initiatives of the assembled workforce. None of the goodwill is expected to be deductible for tax purposes.

[2] Identifiable definite-lived intangible assets were comprised of developed technology and customer relationships of $8.0 million and $0.4 million, respectively, with estimated useful lives of 2.0 years and 1.0 year, respectively, which will be amortized on a straight-line basis over their estimated useful lives.

[3] Subject to adjustment based on (i) purchase price adjustment provisions contained in the acquisition agreements and (ii) indemnification obligations of the acquired company stockholders.