Natural gas revenues Natural gas liquids revenues Lease operating expense (“LOE”) Severance taxes Impairment Depreciation, depletion and amortization (“DD&A”) General and administrative expense (“G&A”) 2017 to $59.40 or 23% for the year ended December 31, 2018. We had a net increase in the volume of oil sold of 542 MBbls or 30%, primarily due to the Bold properties acquired on May 9, 2017 representing a partial prior year, partially offset by the impact of non-core asset divestitures that took place in the third and fourth quarters of 2017. For the year ended December 31, 2018, natural gas revenues decreased by $1.4 million or 16% relative to the comparable period in 2017. Of the decrease, approximately $2.1 million was attributable to a decrease in our realized price, partially offset by an increase of $0.7 million attributable to increased volume. Our average realized price per Mcf decreased from $2.69 for the year ended December 31, 2017 to $2.05 or 24% for the year ended December 31, 2018. The total volume of natural gas produced and sold increased 350 MMcf or 11% primarily due to increased production at our Midland Basin properties as well as the impact of the timing of the Bold Transaction, partially offset by the impact of non-core asset divestitures that took place in the third and fourth quarters of 2017. For the year ended December 31, 2018, natural gas liquids revenues increased by $6.4 million or 60% relative to the comparable period in 2017. Of the increase, approximately $2.3 million was attributable to an increase in our realized price and $4.1 million was attributable to increased volume. The volume of natural gas liquids produced and sold increased by 155 MBbls or 31%, primarily due to the timing of the Bold Transaction which substantially increased our Midland Basin properties on May 9, 2017, partially offset by the impact of non-core asset divestitures that took place in the third and fourth quarters of 2017. LOE includes all costs incurred to operate wells and related facilities for both operated and non-operated properties. In addition to direct operating costs such as labor, repairs and maintenance, re-engineering and workovers, equipment rentals, materials and supplies, fuel and chemicals, LOE includes product marketing and transportation fees, insurance, ad valorem taxes and overhead charges provided for in operating agreements. LOE increased by $0.9 million or 4% for the year ended December 31, 2018 relative to the comparable period in 2017. The increase in LOE was due to a $1.9 million increase related to the Bold properties acquired on May 9, 2017 representing a partial prior year and a $4.4 million increase related to the increased number of producing wells resulting from our 2018 drilling program, offset by a $5.4 million decrease related to non-core asset divestitures that took place in the third and fourth quarters of 2017. Severance taxes for the year ended December 31, 2018 increased by $2.0 million or 33% relative to the comparable period in 2017, primarily due to the increased prices of oil and natural gas liquids, partially offset by the impact of non-core asset divestitures that took place in the third and fourth quarters of 2017. However, as a percentage of revenues from oil, natural gas, and natural gas liquids, severance taxes remained flat when compared to the prior year period. During the year ended December 31, 2018, we recorded non-cash asset impairments of $4.6 million to our unproved oil and natural gas properties resulting from certain acreage expirations related to our Eagle Ford Trend properties. During the year ended December 31, 2017, we recognized $72.2 million of non-cash asset impairments as a result of significant forward commodity price declines and the recording of certain acreage expirations that negatively impacted our results of operations and equity. These impairments consisted of $63.1 million to our proved oil and natural gas properties and $9.1 million to our unproved oil and natural gas properties, primarily to our properties located in the Eagle Ford Trend. See  Note 7. Oil and Natural Gas Properties  in the Notes to Consolidated Financial Statements for a discussion of how impairments are measured. DD&A increased for the year ended December 31, 2018 by $10.7 million, or 29% relative to the comparable period in 2017, due to the addition of the assets acquired in the Bold Transaction to the depletable base, as well as increased production volumes, partially offset by the impact of non- core asset divestitures that took place in the third and fourth quarters of 2017. These expenses consist primarily of employee remuneration, professional and consulting fees and other overhead expenses. G&A increased by $1.1 million for the year ended December 31, 2018 relative to the comparable period in 2017, primarily due to the 51