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Segment Information and Major Customers (Tables)
12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Segment Information by Major Customers
The Company sells its oil and natural gas and liquids production to a number of direct purchasers under direct contracts or through other operators under joint operating agreements.  Listed below are the purchasers of the Company’s production which represented more than
10%
of the Company’s sales in the year 2018.
 
Oil:
    
Apache Corporation
  50.9%
Plains All American Inc.
  17.8
Natural gas and liquids:
    
Apache Corporation
  35.6%
Targa Pipeline 
Mid-Continent
 West Tex, LLC
  21.4%