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Acquisitions and Disposition - Estimated Fair Value of the Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Estimated fair value of the assets acquired and liabilities assumed      
Goodwill $ 282,410 $ 279,259 $ 203,438
Acquiree That Provides Pipeline Integrity Management Software      
Consideration transferred:      
Cash paid 4,380    
Working capital adjustments (152)    
Fair value of contingent consideration 1,142    
Total consideration 5,370    
Estimated fair value of the assets acquired and liabilities assumed      
Current net assets 142    
Other assets 34    
Property, plant and equipment 65    
Intangibles 3,594    
Goodwill 1,535    
Net assets acquired $ 5,370