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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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