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Annual report pursuant to Section 13 and 15(d)

Organization and Description of Business Segments (Details)

v3.10.0.1
Organization and Description of Business Segments (Details)
12 Months Ended
Dec. 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 900,000