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Acquisition of Gordon Trucking, Inc. Allocation of Purchase Price (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Cash Acquired from Acquisition | $ (20,000) |  |
Cash paid (before netting $20 million cash acquired) | $ 115,900 |  |
Stock Issued During Period, Shares, Acquisitions | 2,860,000 |  |
Earn Out Agreement |  |  | $ 13,600
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | $ 0.01
Gordon Trucking Company, Inc [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total fair value of consideration transferred (before netting $20 million cash acquired), excluding debt assumed | $ 172,000 |  |

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