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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
May 20, 2019
Business Acquisition [Line Items]      
Goodwill $ 430,671 $ 436,679  
Sierra Monitor Corporation      
Business Acquisition [Line Items]      
Cash included in current assets     $ 2,100
Current assets (including cash of $2.1 million)     10,500
Property, plant and equipment and other noncurrent assets     1,300
Goodwill $ 19,900   19,900
Total assets acquired     42,700
Total liabilities assumed     6,500
Net assets acquired     36,200
Customer relationships | Sierra Monitor Corporation      
Business Acquisition [Line Items]      
Intangible assets     9,600
Acquired technology | Sierra Monitor Corporation      
Business Acquisition [Line Items]      
Intangible assets     $ 1,400