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Acquisitions - Chiaro Technologies LLC Purchase Price Allocation (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Nov. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 95,280 |  | $ 81,448 | $ 77,388
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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