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Commitments and Contingencies | 12 Months Ended
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Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract] |
Commitments and Contingencies Disclosure [Text Block] | Commitments and Contingencies The Company is a party to ordinary, routine litigation and administrative proceedings incidental to its business. In the opinion of management, the Company’s potential exposure under pending legal proceedings is adequately provided for in the accompanying consolidated financial statements. The total estimated purchase commitments for tractors, net of tractor sale commitments, and trailer equipment, at December 31, 2012, including amounts due on equipment received prior to December 31, 2012, but not paid for, was $44.3 million.

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