Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment - Summary of Property, Plant and Equipment Comprised of Fixed Assets and Oil and Gas Properties (Details)

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Property, Plant and Equipment - Summary of Property, Plant and Equipment Comprised of Fixed Assets and Oil and Gas Properties (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment at cost $ 78,669 $ 161,644
Accumulated DD&A (35,856) (22,041)
Right of use asset — finance leases (Note 15) 20,119 13,437
Property, plant and equipment, net 62,932 153,040
Land    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment at cost 13,808 13,808
Proved properties    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment at cost 61,384 142,494
Wells in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment at cost 0 57
Corporate and other    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment at cost $ 3,477 $ 5,285