Property, Plant and Equipment (Tables)
|12 Months Ended|
Dec. 31, 2017
|Property, Plant and Equipment [Abstract]|
|Summary of Property, Plant and Equipment Comprised of Fixed Assets and Oil and Gas Properties||
Property, plant and equipment is comprised of fixed assets and oil and natural gas properties, as shown below (in thousands):
Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.
Reference 1: http://www.xbrl.org/2003/role/presentationRef