Other Commitments and Contingencies Oil Commitments The Company entered into firm sales agreements for its oil production with four counterparties. Deliveries under three of the sales agreements have commenced. Deliveries under the fourth agreement are expected to commence in the first quarter of 2019. Pursuant to these agreements, we must deliver specific amounts of oil either from our own production or from oil that we acquire from third parties. If we are unable to fulfill all of our contractual obligations, we may be required to pay penalties or damages pursuant to these agreements. Our commitments over the next five years, excluding the contingent commitment described below, are as follows: Year ending December 31, Oil (MBbls) Remainder of 2018 1,072 2019 5,167 2020 4,003 2021 1,672 2022  Thereafter  Total 11,914 During the third quarter of 2018 , we were able to meet all of our delivery obligations, and we anticipate that our current gross operated production will continue to meet our future delivery obligations; although, this cannot be guaranteed. Natural Gas Commitments In collaboration with several other producers and DCP Midstream, LP ("DCP Midstream"), we have agreed to participate in the expansion of natural gas gathering and processing capacity in the D-J Basin.  The first agreement includes a new 200 MMcf per day processing plant ("Mewbourn 3") as well as the expansion of a related gathering system. Starting in August 2018, Mewbourn 3 was complete and in service. Our share of the commitment requires 46.4 MMcf per day to be delivered after the plant in-service date for a period of 7 years.  The second agreement includes an additional 300 MMcf per day processing plant ("O'Connor 2"), including up to 100 MMcf per day of bypass, as well as the expansion of a related gathering system. Construction of the plant is underway and is expected to be placed into service in the second quarter of 2019. Our share of the commitment will require an additional 43.8 MMcf per day to be delivered after the plant in-service date for a period of 7 years. These contractual obligations can be reduced by the collective volumes delivered to the plants by other producers in the D-J Basin that are in excess of such producers' total commitment. If we are unable to fulfill all of our contractual obligations and our obligations are not sufficiently reduced by the collective volumes delivered by other producers, we may be required to pay penalties or damages pursuant to these agreements. During the third quarter of 2018 , we were able to meet all of our delivery obligations, and we anticipate that our current gross operated production will continue to meet our future delivery obligations; although, this cannot be guaranteed. Litigation From time to time, the Company is a party to various commercial and regulatory claims, pending or threatened legal action, and other proceedings that arise in the ordinary course of business. It is the opinion of management that none of the current proceedings are reasonably likely to have a material adverse impact on the Company's business, financial position, results of operations, or cash flows. Office leases The Companys principal office space located in Denver is under lease through July 2022. Current rent under the lease is approximately $66,000 per month. The Company also has a field office lease in Greeley which requires monthly payments of $7,500 through October 2021. Rent expense for offices leases was $0.3 million and $0.2 million for the three months ended September 30, 2018 and 2017 , respectively. For the nine months ended September 30, 2018 and 2017 , rent expense for office leases was $0.7 million and $0.9 million , respectively. Vehicle Leases The Company has entered into a leasing arrangement for its vehicles used in our operations. These leases terminate after four years and are classified as capital leases. The assets associated with these capital leases are recorded within "Other property and equipment, net." A schedule of the minimum lease payments under non-cancellable capital and operating leases as of September 30, 2018 follows (in thousands): Year ending December 31: Vehicles Leases Office Leases Remainder of 2018 $ 41 $ 222 2019 163 896 2020 163 916 2021 189 913 2022 136 500 Thereafter   Total minimum lease payments $ 692 $ 3,447 Less: Amount representing estimated executory cost (57 ) Net minimum lease payments 635 Less: Amount representing interest (92 ) Present value of net minimum lease payments * $ 543 * Reflected in the balance sheet as current and non-current obligations of $111 thousand and $432 thousand , respectively, within "Accounts payable and accrued expenses" and "Other liabilities," respectively.