Revenue Recognition The Companys revenues are primarily derived from transportation services which includes providing freight and carrier services both domestically and internationally via land, air, and sea. The Company disaggregates revenue among its four segments, Ascent, Active On-Demand, LTL and TL, as presented in Note 14. Performance Obligations - A performance obligation is created once a customer agreement with an agreed upon transaction price exists. The terms and conditions of the Companys agreements with customers are generally consistent within each segment. The transaction price is typically fixed and determinable and is not contingent upon the occurrence or non-occurrence of any other event. The transaction price is generally due 30 to 60 days from the date of invoice. The Companys transportation service is a promise to move freight to a customers destination, with the transit period typically being less than one week. The Company views the transportation services it provides to its customers as a single performance obligation. This performance obligation is satisfied and recognized in revenue over the requisite transit period as the customers goods move from origin to destination. The Company determines the period to recognize revenue in transit based upon the departure date and the delivery date, which may be estimated if delivery has not occurred as of the reporting date. Determining the transit period and the percentage of completion as of the reporting date requires management to make judgments that affect the timing of revenue recognized. The Company has determined that revenue recognition over the transit period provides a reasonable estimate of the transfer of goods and services to its customers as the Companys obligation is performed over the transit period. Principal vs. Agent Considerations - The Company utilizes independent contractors and third-party carriers in the performance of some transportation services. The Company evaluates whether its performance obligation is a promise to transfer services to the customer (as the principal) or to arrange for services to be provided by another party (as the agent) using a control model. This evaluation determined that the Company is in control of establishing the transaction price, managing all aspects of the shipments process and taking the risk of loss for delivery, collection, and returns. Based on the Companys evaluation of the control model, it determined that all of the Companys major businesses act as the principal rather than the agent within their revenue arrangements and such revenues are reported on a gross basis. Contract Balances and Costs - The Company applies the practical expedient in ASU No. 2015-14, Revenue from Contracts with Customers, (Topic 606) that permits the Company to not disclose the aggregate amount of transaction price allocated to performance obligations that are unsatisfied as of the end of the period as the Company's contracts have an expected length of one year or less. The Company also applies the practical expedient in Topic 606 that permits the recognition of incremental costs of obtaining contracts as an expense when incurred if the amortization period of such costs is one year or less. These costs are included in purchased transportation costs.