Acquisitions (Details) - USD ($) $ in Thousands			9 Months Ended
	Jan. 01, 2021	Nov. 02, 2020	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill			$ 104,726	$ 88,708
Fair value of assets acquired			0
Contingent payments			800
Analytical Technology, LLC
Business Acquisition [Line Items]
Date of acquisition	Jan. 01, 2021
Outstanding common stock acquired (as a percent)	100.00%
Total purchase consideration			44,000
Receivables			3,900
Inventory			3,900
Other assets			2,500
Intangibles			21,000
Goodwill			16,200
Accounts payable			1,200
Deferred tax liabilities			600
Other liabilities			1,700
Fair value of assets acquired			$ 0
Analytical Technology, LLC | Customer relationships | Minimum
Business Acquisition [Line Items]
Estimated average useful life			12 years
Analytical Technology, LLC | Customer relationships | Maximum
Business Acquisition [Line Items]
Estimated average useful life			15 years
GmbH and Subsidiaries
Business Acquisition [Line Items]
Date of acquisition		Nov. 02, 2020
Outstanding common stock acquired (as a percent)		100.00%
Total purchase consideration			$ 30,500
Receivables			3,100
Inventory			4,300
Other assets			1,200
Intangibles			12,700
Goodwill			17,400
Accounts payable			3,600
Deferred tax liabilities			3,200
Other liabilities			1,300
Cash payment			$ 29,700
GmbH and Subsidiaries | Customer relationships
Business Acquisition [Line Items]
Estimated average useful life			12 years