Operating Leases	3 Months Ended
Operating Leases	Mar. 31, 2015
Leases [Abstract]
Operating Leases	Operating Leases We have operating leases for certain revenue equipment. A portion of these leases are with a commercial tractor dealership, owned by a board member and certain of our employees. Rent expense for these leases were $1.1 million and $2.3 million, (including related-party rental payments totaling $1.1 million and $1.8 million), for the three months ended March 31, 2015 and 2014, respectively, and were included in rent and purchased transportation in the consolidated statements of comprehensive income. The various leases expire in 2015 and 2016. We lease certain terminal facilities under operating leases. A portion of these leases are with limited liability companies, whose members include a board member and certain of our employees and a commercial tractor dealership owned by a board member and certain of our employees. Rent expenses for terminal facilities were $1.0 million and $1.1 million, (including related-party rental payments totaling $1.0 million and 1.0 million), for the three months ended March 31, 2015 and 2014, respectively, and were included in rent and purchased transportation in the consolidated statements of comprehensive income. The various leases expire from 2015 through 2018 and contain options to renew. We have purchase options on the majority of these facilities. We have a right of first refusal on the sale of the Pacific, Washington location property by the owners. We are responsible for all taxes, insurance, and utilities related to the terminal leases. See Notes 6 and 13 for additional information.

The entire disclosure for operating leases of a lessor. This may include a general description of lessor's leasing arrangements for operating leases, including the basis on which contingent rental payments are determined, the existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions.

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