Commitments and Contingencies Environmental Basic is subject to various federal, state and local environmental laws and regulations that establish standards and requirements for protection of the environment. Basic cannot predict the future impact of such standards and requirements, which are subject to change and can have retroactive effectiveness. Basic continues to monitor the status of these laws and regulations. Management believes that the likelihood of any of these items resulting in a material adverse impact to Basics financial position, liquidity, capital resources or future results of operations is remote. Currently, Basic has not been fined, cited or notified of any environmental violations that would have a material adverse effect upon its financial position, liquidity or capital resources. However, management does recognize that by the very nature of its business, material costs could be incurred in the near term to bring Basic into total compliance with the laws and regulations. The amount of such future expenditures is not determinable due to several factors, including the unknown magnitude of possible contamination, the unknown timing and extent of the corrective actions which may be required, the determination of Basics liability in proportion to other responsible parties and the extent to which such expenditures are recoverable from insurance or indemnification. Litigation From time to time, Basic is a party to litigation or other legal proceedings that Basic considers to be a part of the ordinary course of business. Basic is not currently involved in any legal proceedings that it considers probable or reasonably possible, individually or in the aggregate, to result in a material adverse effect on its financial condition, results of operations or liquidity. Sales and Use Tax Audit In 2014, Basic was notified by the Texas State Comptrollers office that a sales and use tax audit for the period from 2010 through 2013 would be conducted. A preliminary report has been issued in the second quarter of 2018 for this audit, and Basic will appeal the preliminary report through the redetermination process. Based on our analysis, the potential liability associated with this audit ranges from $6.0 million to $24.0 million. An accrual for the estimated liability of $6.0 million has been recorded in Basics financial statements as general and administrative expense and the related interest associated with the taxes of $1.5 million is included in interest expense for the nine months ended September 30, 2018. This range could potentially change in future periods as the appeals and redetermination process progresses. Self-Insured Risk Accruals Basic is self-insured up to retention limits as it relates to workers compensation, general liability claims, and medical and dental coverage of its employees. Basic generally maintains no physical property damage coverage on its workover rig fleet, with the exception of certain of its 24-hour workover rigs and newly manufactured rigs. Basic has deductibles per occurrence for workers compensation, general liability claims, automobile liability and medical coverage of $4.0 million, $1.0 million, $1.0 million, and $425,000, respectively. Basic maintains accruals in the accompanying consolidated balance sheets related to self-insurance retentions based upon third-party acturial data and claims history. At September 30, 2018 and December 31, 2017, self-insured risk accruals totaled approximately $31.5 million, net of $29,000 receivable for medical and dental coverage, and $30.3 million, net of $971,000 receivable for medical and dental coverage, respectively.