Acquisitions - Preliminary Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2019	May 20, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 436,679		$ 413,640	$ 422,185
Globe Holding Company LLC
Business Acquisition [Line Items]
Current assets					$ 28,600
Cash included in current assets					58
Property, plant and equipment					8,300
Goodwill					74,500
Total assets acquired					222,100
Total liabilities assumed					5,700
Net assets acquired					216,400
Sierra Monitor Corporation
Business Acquisition [Line Items]
Current assets		$ 10,500
Cash included in current assets		2,100
Property, plant and equipment		1,300
Goodwill		19,900
Total assets acquired		42,700
Total liabilities assumed		6,500
Net assets acquired		36,200
Customer-related intangibles | Globe Holding Company LLC
Business Acquisition [Line Items]
Finite-lived intangible assets					40,200
Acquired technology | Globe Holding Company LLC
Business Acquisition [Line Items]
Finite-lived intangible assets					$ 10,500
Acquired technology | Sierra Monitor Corporation
Business Acquisition [Line Items]
Finite-lived intangible assets		1,400
Customer relationships | Sierra Monitor Corporation
Business Acquisition [Line Items]
Finite-lived intangible assets		$ 9,600
Trade Names | Globe Holding Company LLC
Business Acquisition [Line Items]
Indefinite-lived intangible assets				$ 60,000