Commitments and Contingencies Transportation Demand Charges As of September 30, 2018 , we have contracts that provide firm transportation capacity on pipeline systems. The remaining term on these contracts is approximately two years and require us to pay transportation demand charges regardless of the amount of pipeline capacity we utilize. The values in the table below represent gross future minimum transportation demand charges we are obligated to pay as of September 30, 2018 . However, our financial statements will reflect our proportionate share of the charges based on our working interest and net revenue interest, which will vary from property to property. September 30, 2018 (in thousands) October 1, 2018 - December 31, 2018 $ 205 2019 821 2020 410 Total $ 1,436 Lease Commitments Rent expense for our office leases was $1.7 million for the nine months ended September 30, 2018 (Successor) and $0.2 million and $1.1 million for the two months ended September 30, 2017 (Successor) and the seven months ended July 31, 2017 (Predecessor), respectively. The rent expense relates to the lease of our office space in Houston, Texas as well as office leases in our other operating areas. As of September 30, 2018 , the minimum contractual obligations were approximately $9.6 million in the aggregate. September 30, 2018 (in thousands) October 1, 2018 - December 31, 2018 $ 334 2019 1,211 2020 1,149 2021 1,170 2022 1,205 Thereafter 4,503 Total $ 9,572 Development Commitments We have commitments to third-party operators under joint operating agreements relating to the drilling and completion of oil and natural gas wells. As of September 30, 2018 , total estimated costs to be spent in 2018 and 2019 are approxim ately $12.9 million and $26.6 million , respectively. Legal Proceedings Litigation Relating to Vanguards 2015 merger with LRR Energy, L.P. In June and July 2015, purported unitholders of LRR Energy, L.P. (LRE) filed four lawsuits challenging Vanguards 2015 merger with LRE (the LRE Merger). These lawsuits were styled (a) Barry Miller v. LRR Energy, L.P. et al., Case No. 11087-VCG, in the Court of Chancery of the State of Delaware; (b) Christopher Tiberio v. Eric Mullins et al., Cause No. 2015-39864, in the District Court of Harris County, Texas, 334th Judicial District; (c) Eddie Hammond v. Eric Mullins et al., Cause No. 2015-40154, in the District Court of Harris County, Texas, 295th Judicial District; and (d) Ronald Krieger v. LRR Energy, L.P. et al., Civil Action No. 4:15-cv-2017, in the United States District Court for the Southern District of Texas, Houston Division. These lawsuits have been voluntarily dismissed or nonsuited. On August 18, 2015, another purported LRE unitholder (the LRE Plaintiff) filed a putative class action lawsuit in connection with the LRE Merger. This lawsuit is styled Robert Hurwitz v. Eric Mullins et al., Civil Action No. 1:15-cv-00711-MAK, in the United States District Court for the District of Delaware (the LRE Lawsuit). On June 22, 2016, the LRE Plaintiff filed his Amended Class Action Complaint (the Amended LRE Complaint) against LRE, the members of the board of directors of the general partner of LRE, Vanguard, Lighthouse Merger Sub, LLC, and the members of Vanguards board of directors (the LRE Lawsuit Defendants). In the Amended LRE Complaint, the LRE Plaintiff alleges multiple causes of action under the Securities Act and Exchange Act related to the registration statement and proxy statement filed with the SEC in connection with the LRE Merger (the LRE Proxy). In general, the LRE Plaintiff alleges that the LRE Proxy failed, among other things, to disclose allegedly material details concerning Vanguards (x) debt obligations and (y) ability to maintain distributions to unitholders. Based on these allegations, the LRE Plaintiff sought, among other relief, to rescind the LRE Merger, and an award of damages, attorneys fees, and costs. On January 2, 2018, the court in the LRE Lawsuit certified a class of plaintiffs that includes all persons or entities holding LRE common units as of August 28, 2015, through the close of the LRE Merger on October 5, 2015, but excluding the LRE Lawsuit Defendants and certain related persons and entities (the LRE Class). The window for potential members of the LRE Class to request exclusion from the LRE Class closed on May 29, 2018, with 22 LRE unitholders timely requesting exclusion. On June 27, 2018, the LRE Lawsuit Defendants and the LRE Plaintiff, on his own behalf and on behalf of the LRE Class, entered into a stipulation of settlement (the Stipulation). As amended on July 11, 2018, and on July 25, 2018, the Stipulation provides that the LRE Class will settle and release all claims against the LRE Lawsuit Defendants relating to the LRE Merger, in exchange for an aggregate settlement payment of $8.0 million . Of that settlement amount, Vanguard will contribute $0.7 million , with the remainder to be paid by the insurers of the LRE Lawsuit Defendants. The LRE Lawsuit Defendants continue to deny all allegations of liability or wrongdoing. On July 18, 2018, the court held a hearing to consider whether to preliminarily approve the proposed settlement. In response to matters raised at that hearing, on July 25, 2018, the LRE Lawsuit Defendants and the LRE Plaintiff amended the Stipulation and submitted to the court a revised notice of proposed settlement, proof of claim and release form, and summary notice of proposed settlement. On July 26, 2018, the court entered an order preliminarily approving the settlement as set forth in the amended Stipulation. The court has scheduled a hearing to consider final approval of the settlement on December 14, 2018. At that hearing, the court will determine, among other things, whether the proposed settlement is fair and reasonable to the LRE Class and should be approved, thereby forever barring the LRE Class (other than potential members excluded therefrom) from asserting any of the released claims against the LRE Lawsuit Defendants. We are also defendants in certain legal proceedings arising in the normal course of our business. Management does not believe that it is probable that the outcome of these actions will have a material adverse effect on the Companys condensed consolidated financial position, results of operations or cash flow, although the ultimate outcome and impact of such legal proceedings on the Company cannot be predicted with certainty. Furthermore, our insurance may not be adequate to cover all liabilities that may arise out of claims brought against us. If one or more negative outcomes were to occur relative to these matters, the aggregate impact to our financial position, results of operations or cash flow could be material. In addition, we are not aware of any legal or governmental proceedings against us, or contemplated to be brought against us, under applicable environmental laws, that could have a material adverse effect on the Companys condensed consolidated financial position, results of operations or cash flow.