Commitments And Contingencies	3 Months Ended
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies As of March 31, 2017, we have committed to property and equipment purchases of approximately $99.9 million. We are involved in certain claims and pending litigation arising in the ordinary course of business. The majority of these claims relate to bodily injury, property damage, cargo and workers’ compensation incurred in the transportation of freight, as well as certain class action litigation related to personnel and employment matters. We accrue for the uninsured portion of contingent losses from these and other pending claims when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Based on the knowledge of the facts, management believes the resolution of claims and pending litigation, taking into account existing reserves, will not have a material adverse effect on our consolidated financial statements. Moreover, the results of complex legal proceedings are difficult to predict and our view of these matters may change in the future as the litigation and related events unfold. We are involved in class action litigation in the U.S. District Court for the District of Nebraska, in which the plaintiffs allege that we owe drivers for unpaid wages under the Fair Labor Standards Act (FLSA) and the Nebraska Wage Payment and Collection Act and that we failed to pay minimum wage per hour for drivers in our student driver training program, related to short break time and sleeper berth time. The period covered by this class action suit dates back to 2008 through March 2014. In August 2015, the court denied our motion for summary judgment and granted the plaintiff’s motion for summary judgment, ruling in plaintiff’s favor on both theories of liability (short breaks and sleeper berth time). During second quarter 2016, the court issued two rulings, the first of which dismissed plaintiff’s claims under the Nebraska Wage Payment and Collection Act (but not the FLSA) and the second of which granted our motion to strike plaintiff’s untimely damages calculations. As a result, we reduced our accrual in second quarter 2016, and we had a $1.2 million estimated liability at March 31, 2017 related to the short break matter. In February 2017, the court revised the decision from August 2015 and denied summary judgment to the plaintiffs on the sleeper berth issue. In doing so, the court also ruled that the Company had not willfully violated the law on the sleeper berth claim and dismissed the liquidated damages portion of the case, related to the sleeper berth claim. Based on the knowledge of the facts related to the sleeper berth matter, management does not currently believe a loss is probable, thus we have not accrued for the sleeper berth matter. We are currently unable to determine the possible loss or range of loss. We intend to vigorously defend the merits of these claims and to appeal any adverse verdict in this case. We are also involved in certain class action litigation in which the plaintiffs allege claims for failure to provide meal and rest breaks, unpaid wages, unauthorized deductions and other items. Based on the knowledge of the facts, management does not currently believe the outcome of these class actions is likely to have a material adverse effect on our financial position or results of operations. However, the final disposition of these matters and the impact of such final dispositions cannot be determined at this time.

Commitments and Contingencies

As of March 31, 2017, we have committed to property and equipment purchases of approximately $99.9 million.

We are involved in certain claims and pending litigation arising in the ordinary course of business. The majority of these claims relate to bodily injury, property damage, cargo and workers’ compensation incurred in the transportation of freight, as well as certain class action litigation related to personnel and employment matters. We accrue for the uninsured portion of contingent losses from these and other pending claims when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Based on the knowledge of the facts, management believes the resolution of claims and pending litigation, taking into account existing reserves, will not have a material adverse effect on our consolidated financial statements. Moreover, the results of complex legal proceedings are difficult to predict and our view of these matters may change in the future as the litigation and related events unfold.

We are involved in class action litigation in the U.S. District Court for the District of Nebraska, in which the plaintiffs allege that we owe drivers for unpaid wages under the Fair Labor Standards Act (FLSA) and the Nebraska Wage Payment and Collection Act and that we failed to pay minimum wage per hour for drivers in our student driver training program, related to short break time and sleeper berth time. The period covered by this class action suit dates back to 2008 through March 2014. In August 2015, the court denied our motion for summary judgment and granted the plaintiff’s motion for summary judgment, ruling in plaintiff’s favor on both theories of liability (short breaks and sleeper berth time). During second quarter 2016, the court issued two rulings, the first of which dismissed plaintiff’s claims under the Nebraska Wage Payment and Collection Act (but not the FLSA) and the second of which granted our motion to strike plaintiff’s untimely damages calculations. As a result, we reduced our accrual in second quarter 2016, and we had a $1.2 million estimated liability at March 31, 2017 related to the short break matter. In February 2017, the court revised the decision from August 2015 and denied summary judgment to the plaintiffs on the sleeper berth issue. In doing so, the court also ruled that the Company had not willfully violated the law on the sleeper berth claim and dismissed the liquidated damages portion of the case, related to the sleeper berth claim. Based on the knowledge of the facts related to the sleeper berth matter, management does not currently believe a loss is probable, thus we have not accrued for the sleeper berth matter. We are currently unable to determine the possible loss or range of loss. We intend to vigorously defend the merits of these claims and to appeal any adverse verdict in this case.

We are also involved in certain class action litigation in which the plaintiffs allege claims for failure to provide meal and rest breaks, unpaid wages, unauthorized deductions and other items. Based on the knowledge of the facts, management does not currently believe the outcome of these class actions is likely to have a material adverse effect on our financial position or results of operations. However, the final disposition of these matters and the impact of such final dispositions cannot be determined at this time.