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LEASES - ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Operating leases    
Total right-of-use asset $ 28,046 $ 29,486
Total lease liability 28,357 29,905
Field equipment    
Operating leases    
Total right-of-use asset 20,716 27,537
Total lease liability 20,716 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 6,519 1,481
Total lease liability 6,830 1,900
Vehicles    
Operating leases    
Total right-of-use asset 811 468
Total lease liability $ 811 $ 468