11. Commitments and Contingencies In the normal course of business, the Company is subjected to various claims, legal actions, contract negotiations and disputes. The Company provides for losses, if any, in the year in which they can be reasonably estimated. In managements opinion, there are currently no such matters outstanding that would have a material effect on the accompanying condensed consolidated financial statements. The table below provides estimates of the timing of future payments that we are contractually obligated to make based on agreements in place at June 30, 2019: For the Year Ending December 31, 2019 2020 2021 2022 2023 Thereafter Total (in thousands) Operating lease obligations (1) $ 486 $ 1,116 $ 1,060 $ 1,091 $ 1,100 $ 9,463 $ 14,316 Finance lease obligations (2) 22 35 33 33 33 40 196 Commitment fees on Revolving Loan (3) 67 125 125 40   357 Purchase commitments (4) 6,797      6,797 Other commitments 60 259 239 25   583 Total $ 7,432 $ 1,535 $ 1,457 $ 1,189 $ 1,133 $ 9,503 22,249 (1) Operating lease obligations are related to our 30-year land lease with the State of Oklahoma related to the Company's Kingfisher Facility, as well as other office, land and equipment leases. Refer to Note 6. Leases. (2) Finance lease obligations are related to our finance lease of a building at our Early, Texas manufacturing facility with the City of Early and leases of certain office equipment with purchase options upon the end of lease terms which are accounted for as finance leases with various expiration dates. Refer to Note 6. Leases. (3) Commitment fees on our Revolving Loan were calculated based on the unused portion of lender commitments, at the applicable commitment fee rate of 0.25%. See Note 7. Senior Secured Credit Facility, for interest requirements per the 2019 Credit Agreement. (4) Purchase commitments primarily relate to our agreement with our suppliers for material and parts purchases to be used in the manufacturing of our systems. The purchase commitments represent open purchase orders to our suppliers. Other Commitments In the normal course of business, the Company has certain short-term purchase obligations and commitments for products and services, primarily related to purchases of materials used in the manufacturing of its systems. As of June 30, 2019 and December 31, 2018, the Company had commitments of approximately $6,797 and $18,998, respectively, related to these commitments. In connection with the acquisition of Railtronix, the seller is entitled to certain performance-based cash awards totaling $2,500 upon the achievement of certain financial milestones. As of June 30, 2019, one milestone had been achieved and the Company paid and recognized $1,625 in June 2018 in other operating expense in the condensed consolidated statements of operations. However, as of June 30, 2019, the Company had not concluded that the remaining milestone will be achieved and thus has not recognized additional obligations in the condensed consolidated financial statements. The Company has executed a guarantee of lease agreement with Solaris Energy Management, LLC, a related party of the Company, related to the rental of office space for the Companys corporate headquarters. The total future guaranty under the guarantee of lease agreement with Solaris Energy Management, LLC is $9,724 as of June 30, 2019. Refer to Note 12. Related Party Transactions for additional information regarding related party transactions recognized and Note 6. Leases for operating lease discussion.