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ACQUISITIONS AND DIVESTITURES - Pro Well Acquisition (Details) - USD ($)
$ in Thousands
1 Months Ended
Nov. 20, 2018
Mar. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Less: identified assets acquired and liabilities assumed          
Goodwill     $ 266,934 $ 273,801 $ 273,421
Pro Well Acquisition          
Consideration transferred          
Cash paid $ 11,754        
Total consideration transferred 11,754 $ 11,800      
Less: identified assets acquired and liabilities assumed          
Working capital 1,051        
Property and equipment 6,588        
Total identifiable net assets acquired 10,639        
Goodwill 1,115        
Fair value allocated to net assets acquired 11,754        
Initial payment 12,400        
Purchase price 11,754 $ 11,800      
Pro Well Acquisition | Customer relationships          
Less: identified assets acquired and liabilities assumed          
Intangible assets $ 3,000