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Acquisition of Gordon Trucking, Inc. (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Nov. 01, 2016 | Dec. 31, 2015 | Nov. 01, 2015 | Dec. 31, 2014 | Nov. 11, 2013
Business Acquisition [Line Items] |  |  |  |  |  |
business combination contingent consideration fair value non-current |  |  | $ 12,200 |  | $ 11,300 |
business combination contingent consideration fair value current |  |  |  |  | $ 2,300 |
Total acquisition purchase price | $ 300,000 |  |  |  |  |
Payments to Acquire Intangible Assets | 15,000 |  |  |  |  |
Fair Value of Stock in Escrow Related To Acquisition of Business |  |  |  |  |  | $ 24,000
Fair Value of Cash in Escrow as a Result of Business Combination |  |  |  |  |  | 6,000
Noncash or Part Noncash Acquisition, Debt Assumed | 148,000 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 175,000 |  | $ 200,000 |  | 250,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | $ 20,000 |  |  | $ 20,000
Cash Acquired from Acquisition | 20,000 |  |  |  |  |
Business Combination, Acquisition Related Costs | 2,200 |  |  |  |  |
Gordon Trucking Company, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total acquisition purchase price | $ 285,000 |  |  |  |  |

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