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Acquisitions - Webscan, Inc Purchase Price Allocation (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 09, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 95,280 |  | $ 81,448 | $ 77,388
Webscan, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  | $ 504 |  |
Inventories |  | 296 |  |
Prepaid expenses and other current assets |  | 8 |  |
Goodwill |  | 925 |  |
Accounts payable |  | (77) |  |
Purchase price |  | 3,176 |  |
Customer Relationships [Member] | Webscan, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  | 680 |  |
Technology-Based Intangible Assets [Member] | Webscan, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets |  | $ 840 |  |

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