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Acquisitions - Schedule of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Feb. 06, 2018	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 1,662,438	$ 1,614,494
Cedexis, Inc. [Member]
Business Acquisition [Line Items]
Current assets	$ 8,961
Intangible assets	27,200
Goodwill	47,944
Other assets	69
Assets acquired	84,174
Other current liabilities assumed	5,711
Assumed debt	5,674
Deferred taxes	768
Net assets acquired	$ 72,021
Minimum [Member] \| Cedexis, Inc. [Member]
Business Acquisition [Line Items]
Weighted average useful life	1 year
Maximum [Member] \| Cedexis, Inc. [Member]
Business Acquisition [Line Items]
Weighted average useful life	6 years