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Acquisitions (Narrative) (Details) $ in Thousands, € in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) business | Mar. 31, 2017 EUR (€) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of businesses acquired | business | 2 |  |  |
Amount paid at closing |  |  | $ 0 | $ 14,529
Two software companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price of acquired assets | $ 15,000 |  |  |
Amount paid at closing | 12,000 |  |  |
Contingent payment | $ 3,000 |  |  | 3,000
Contingent payment period | 36 months |  |  |
Goodwill expected to be tax deductible | $ 13,300 |  |  |
Reference laboratory in Austria |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price of acquired assets | € |  | € 1.3 |  |
Customer relationships | Two software companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets | 1,000 |  |  | 1,000
Technology intangible assets | Two software companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets | $ 600 |  |  | $ 600

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