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Acquisitions - Chiaro Technologies LLC Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 113,208	$ 95,280		$ 81,448
Chiaro Technologies LLC [Member]
Business Acquisition [Line Items]
Prepaid expenses and other current assets			$ 3
Goodwill			2,911
Accrued expenses			(115)
Purchase price			4,149
Technology-Based Intangible Assets [Member] | Chiaro Technologies LLC [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets			$ 1,350

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