Commitments and Contingencies	6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES In the ordinary course of conducting our business we become involved in certain legal matters and investigations on a number of matters, including liability claims, taxes other than income taxes, contract disputes, employment, and other litigation matters. We accrue for anticipated costs to defend and resolve matters that are probable and estimable. We believe the outcomes of these matters will not have a material impact on our business or our financial statements. At June 30, 2018, our firm commitments to purchase transportation equipment totaled approximately $213.5 million. WSL Acquisition The purchase and sale agreement related to our June 2016 acquisition of WSL included guaranteed payments of $20.0 million to the former owners of WSL on each of the first three anniversary dates of the closing. The liability recorded was discounted between one percent and three percent, based on credit-adjusted discount rates. The initial payment in the amount of $19.7 million, including calculated interest based on the discounted amount recorded, was made in June 2017 and reflected an adjustment for a working capital true-up. The second payment in the amount of $20.0 million was made in June 2018. The present value of the remaining payment was $18.7 million at June 30, 2018, which is recorded in other current liabilities on the consolidated balance sheet. The representative of the former owners of WSL has claimed that we have not fulfilled certain obligations under the purchase and sale agreement relating to the post-closing operations of the business, amongst other matters, and that, as a result, the former owners are entitled to an accelerated payment of the contingent amount described in Note 3, Fair Value, without regard to whether the specified earnings targets are met. We believe this claim is meritless and have filed an action in the Delaware Court of Chancery seeking a declaratory judgment that we have complied with our obligations under the agreement and that no accelerated payment is owed.

COMMITMENTS AND CONTINGENCIES

In the ordinary course of conducting our business we become involved in certain legal matters and investigations on a number of matters, including liability claims, taxes other than income taxes, contract disputes, employment, and other litigation matters. We accrue for anticipated costs to defend and resolve matters that are probable and estimable. We believe the outcomes of these matters will not have a material impact on our business or our financial statements.

At June 30, 2018, our firm commitments to purchase transportation equipment totaled approximately $213.5 million.

WSL Acquisition

The purchase and sale agreement related to our June 2016 acquisition of WSL included guaranteed payments of $20.0 million to the former owners of WSL on each of the first three anniversary dates of the closing. The liability recorded was discounted between one percent and three percent, based on credit-adjusted discount rates. The initial payment in the amount of $19.7 million, including calculated interest based on the discounted amount recorded, was made in June 2017 and reflected an adjustment for a working capital true-up. The second payment in the amount of $20.0 million was made in June 2018. The present value of the remaining payment was $18.7 million at June 30, 2018, which is recorded in other current liabilities on the consolidated balance sheet.

The representative of the former owners of WSL has claimed that we have not fulfilled certain obligations under the purchase and sale agreement relating to the post-closing operations of the business, amongst other matters, and that, as a result, the former owners are entitled to an accelerated payment of the contingent amount described in Note 3, Fair Value, without regard to whether the specified earnings targets are met. We believe this claim is meritless and have filed an action in the Delaware Court of Chancery seeking a declaratory judgment that we have complied with our obligations under the agreement and that no accelerated payment is owed.