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Acquisition of Gordon Trucking, Inc. Acquisition pro forma information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Acquisition of Gordon Trucking, Inc. [Abstract] |  |
Business Acquisition, Pro Forma Revenue | $ 961,525 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 972,340 us-gaap_BusinessAcquisitionsProFormaRevenue
Business Acquisition, Pro Forma Net Income (Loss) | $ 90,821 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 64,769 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss

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- Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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