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LEASES - ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Operating leases    
Total right-of-use asset $ 28,595 $ 29,486
Total lease liability 28,856 29,905
Field equipment    
Operating leases    
Total right-of-use asset 23,606 27,537
Total lease liability 23,606 27,537
Finance leases    
Right-of-use asset - field equipment 0 219
Lease liability - field equipment 0 117
Corporate leases    
Operating leases    
Total right-of-use asset 4,011 1,481
Total lease liability 4,272 1,900
Vehicles    
Operating leases    
Total right-of-use asset 978 468
Total lease liability $ 978 $ 468