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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
May 20, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 433,156   $ 413,640
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 $ 19,800 19,800  
Total assets acquired   42,600  
Total liabilities assumed   6,400  
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