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Acquisition of Gordon Trucking, Inc. Potential Earn Out Schedule (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Nov. 11, 2013
Acquisition of Gordon Trucking [Abstract] |  |  |  |
Potential Earn Out, 2014 | $ 6,000 |  |  |
Potential Earn Out, 2015 | 6,000 |  |  |
Potential Earn Out, 2016 & 2017 | 8,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 20,000 |  |  | $ 20,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | (1,764) | $ 0 | $ 0 |
Earn Out Agreement |  | 13,600 |  |
business combination contingent consideration fair value non-current | $ 12,200 | $ 11,300 |  |

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