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Acquisitions and Divestitures (Tables)
 12 Months Ended
Dec. 31, 2018
EOG Acquisition  
Business Acquisition [Line Items]  
Fair Value of Acquired Assets and Liabilities The following table summarizes the final adjusted purchase price and the values of assets acquired and liabilities assumed.
Final Adjusted Purchase Price
Total consideration given$54,332 
Final Adjusted Allocation of Purchase Price
Oil and natural gas properties included in the full cost pool:
Proved oil and natural gas properties $43,745 
Undeveloped oil and natural gas properties8,650 
Total oil and natural gas properties included in the full cost pool (1)
52,395 
Gas gathering equipment and other2,340 
Asset retirement obligation(403)
Fair value of net assets acquired$54,332 
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2.We used a discounted cash flow model and made market assumptions as to future commodity prices, projections of estimated quantities of oil and natural gas reserves, expectations for timing and amount of future development and operating costs, projections of future rates of production, expected recovery rates, and risk adjusted discount rates.
Excalibur Acquisition  
Business Acquisition [Line Items]  
Fair Value of Acquired Assets and Liabilities The following table summarizes the final adjusted purchase price and the values of assets acquired and liabilities assumed.
Preliminary Purchase Price
Total consideration given$29,633 
Preliminary Allocation of Purchase Price
Oil and natural gas properties included in the full cost pool:
Proved oil and natural gas properties$14,546 
Undeveloped oil and natural gas properties15,502 
Total oil and natural gas properties included in the full cost pool (1)
30,048 
Asset retirement obligation(415)
Fair value of net assets acquired$29,633 
_________________________ 
1.We used a discounted cash flow model and made market assumptions as to future commodity prices, projections of estimated quantities of oil and natural gas reserves, expectations for timing and amount of future development and operating costs, projections of future rates of production, expected recovery rates, and risk adjusted discount rates.