Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business Segments - Narrative (Details)

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Organization and Description of Business Segments - Narrative (Details)
a in Thousands
3 Months Ended
Mar. 31, 2018
a
segment
Organization, Consolidation and Presentation of Financial Statements [Line Items]  
Number of operating segments | segment 2
West Texas  
Organization, Consolidation and Presentation of Financial Statements [Line Items]  
Area of land (in acres) | a 890