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Acquisitions and Goodwill (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 07, 2017 USD ($) | Aug. 29, 2016 USD ($) | Jan. 25, 2016 USD ($) | Mar. 09, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 112,391 |  |  | $ 112,391 |  |  |  |  |
Carrying value of goodwill | 191,535 |  |  | 191,535 | $ 184,675 |  |  |  |
Goodwill, Acquired During Period |  |  |  | $ 6,860 |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  | $ 16,501 |  |  |  |  |  |
Escrow Reimbursements Received |  | $ 2,525 |  |  |  |  |  |  |
Recovery of Direct Costs |  | 1,621 |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Adjustments |  | $ 904 |  |  |  |  |  |  |
Number of Reporting Units |  |  |  | 5 |  |  |  |  |
Atlantic [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  | $ 22,500 |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  | 1,000 |  |  |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  |  |  |  | 62,300 |  |  |  |
Operating Revenue Since Acquisition Date | 14,745 |  |  |  |  |  |  |  |
Carrying value of goodwill |  |  |  |  |  | 6,860 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  | 1,821 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets |  |  |  |  |  | 1,821 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  | 21,410 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  | 23,231 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  |  |  |  | 590 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation |  |  |  |  |  | 141 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  | 731 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets |  |  |  |  |  | 22,500 |  |  |
Business Combination, Pro Forma Information, Operating Income of Acquiree since Acquisition Date, Actual | 1,119 |  |  |  |  |  |  |  |
Towne [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Escrow Deposit |  |  |  |  |  |  |  |  | $ 16,500
Triumph & Ace [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of goodwill |  |  |  |  |  |  | $ 6,282 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | 1,294 |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets |  |  |  |  |  |  | 1,294 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | 11,756 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  | 13,050 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  |  |  |  |  | 1,250 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  | 1,250 |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets |  |  |  |  |  |  | 11,800 |  |
Triumph [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  | 10,100 |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  | 1,250 |  |
Expedited LTL [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of goodwill | 97,593 |  |  | $ 97,593 | 97,593 |  |  |  |
Truckload Expedited [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of goodwill | 45,164 |  |  | 45,164 | 45,164 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss | (25,686) |  |  | (25,686) | (25,686) |  |  |  |
Other Asset Impairment Charges |  |  | $ 255 |  |  |  |  |  |
Pool Distribution [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of goodwill | 12,359 |  |  | 12,359 | 12,359 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss | (6,953) |  |  | (6,953) | (6,953) |  |  |  |
Intermodal [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of goodwill | $ 69,058 |  |  | 69,058 | $ 62,198 |  |  |  |
Goodwill, Acquired During Period |  |  |  | $ 6,860 |  |  |  |  |
Ace [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  |  | $ 1,700 |
Noncompete Agreements [Member] | Atlantic [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 5 years |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  | 1,150 |  |  |
Noncompete Agreements [Member] | Triumph & Ace [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 5 years |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  | 139 |  |
Customer Relationships [Member] | Atlantic [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 15 years |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  | $ 13,400 |  |  |
Customer Relationships [Member] | Triumph & Ace [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 15 years |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  | $ 5,335 |  |

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