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Acquisitions - Preliminary Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
May 20, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 443,272 $ 436,679   $ 413,640
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  
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