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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