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Revenues Product revenue by type (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Revenue from External Customer [Line Items] |  |
Total revenues | $ 202,517 | $ 182,619
Hardware and software |  |
Revenue from External Customer [Line Items] |  |
Total revenues | 120,221 | 107,451
Consumables |  |
Revenue from External Customer [Line Items] |  |
Total revenues | 21,087 | 19,438
Other |  |
Revenue from External Customer [Line Items] |  |
Total revenues | 4,302 | 3,770
Product revenues |  |
Revenue from External Customer [Line Items] |  |
Total revenues | $ 145,610 | $ 130,659

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