Oil and Natural Gas Production Activities	6 Months Ended
Jun. 30, 2019
Oil and Gas Property [Abstract]
Oil and Natural Gas Production Activities	5. OIL AND NATURAL GAS PRODUCTION ACTIVITIES In May 2019, the Company exchanged approximately 905 leasehold acres of the Georgetown formation and deeper rights in Dimmit and Zavala counties for working interests in certain wells that were drilled by CML Exploration in the first half of 2019. The effective date of the exchange was March 1, 2019. Ceiling Test and Impairment The reserves used in the ceiling test incorporate assumptions regarding pricing and discount rates over which management has no influence in the determination of present value. In the calculation of the ceiling test as of June 30, 2019, the Company used $61.45 per barrel for oil and $3.02 per MMbtu for natural gas (as further adjusted for property, specific gravity, quality, local markets and distance from markets) to compute the future cash flows of the Company’s producing properties. The discount factor used was 10%. There was no impairment for the six-month periods ended June 30, 2019 and 2018 of the Company’s oil and natural gas properties. Impairment charges in previous years are generally the result of declines in the price of oil and natural gas, additional capitalized well costs and changes in production.

Oil and Natural Gas Production Activities

6 Months Ended

Jun. 30, 2019

Oil and Natural Gas Production Activities

5. OIL AND NATURAL GAS PRODUCTION ACTIVITIES

In May 2019, the Company exchanged approximately 905 leasehold acres of the Georgetown formation and deeper rights in Dimmit and Zavala counties for working interests in certain wells that were drilled by CML Exploration in the first half of 2019. The effective date of the exchange was March 1, 2019.

Ceiling Test and Impairment

The reserves used in the ceiling test incorporate assumptions regarding pricing and discount rates over which management has no influence in the determination of present value. In the calculation of the ceiling test as of June 30, 2019, the Company used $61.45 per barrel for oil and $3.02 per MMbtu for natural gas (as further adjusted for property, specific gravity, quality, local markets and distance from markets) to compute the future cash flows of the Company’s producing properties. The discount factor used was 10%.

There was no impairment for the six-month periods ended June 30, 2019 and 2018 of the Company’s oil and natural gas properties. Impairment charges in previous years are generally the result of declines in the price of oil and natural gas, additional capitalized well costs and changes in production.