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Acquisitions (Narrative) (Details) $ in Thousands, € in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) business | Jun. 30, 2017 USD ($) business | Mar. 31, 2017 EUR (€) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 216,046 |  |  |  | $ 216,046 |  | $ 199,873
Number of businesses acquired | business |  |  | 2 |  |  |  |
Amount paid at closing |  |  |  |  | 22,500 | $ 14,529 |
Software company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price of acquired assets | 25,000 |  |  |  |  |  |
Holdback payment | 1,000 |  |  |  |  |  |
Contingent payment | 1,500 |  |  |  | 1,500 |  |
Goodwill | 20,300 |  |  |  | 20,300 |  |
Net tangible liabilities | $ 300 |  |  |  | 300 |  |
Contingent payment period | 36 months |  |  |  |  |  |
Reference laboratory in the United States |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price of acquired assets | $ 500 |  |  |  |  |  |
Three reference laboratory customer lists |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price of acquired assets |  | $ 1,300 |  |  |  |  |
Number of businesses acquired | business |  | 3 |  |  |  |  |
Two software companies |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price of acquired assets |  |  | $ 15,000 |  |  |  |
Contingent payment |  |  | 3,000 |  |  |  |
Goodwill |  |  | 13,300 |  |  |  |
Amount paid at closing |  |  | $ 12,000 |  |  |  |
Contingent payment period |  |  | 36 months |  |  |  |
Reference laboratory in Austria |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price of acquired assets | € |  |  |  | € 1.3 |  |  |
Technology intangible assets | Software company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets | 2,600 |  |  |  | 2,600 |  |
Technology intangible assets | Two software companies |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets |  |  | $ 600 |  |  |  |
Customer relationships | Software company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets | $ 2,400 |  |  |  | $ 2,400 |  |
Customer relationships | Two software companies |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets |  |  | $ 1,000 |  |  |  |

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