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Acquisitions and Long-Lived Assets (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 14, 2019 | Apr. 21, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Oct. 28, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  | $ 890 | $ (455) |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | $ 141,279 |  | 141,279 |  |  |
Operating Lease, Right-of-Use Asset |  |  | 158,977 |  | 158,977 |  | $ 0 |
Carrying value of goodwill |  |  | 220,423 |  | 220,423 |  | 199,092 |
Finance Lease, Liability |  |  | 7,555 |  | 7,555 |  |  |
Operating Lease, Liability |  |  | 159,690 |  | 159,690 |  |  |
Reduction of depreciation due to useful life study |  |  | 1,000 |  | $ 1,000 |  |  |
Reserve for loss on operating asset |  |  | $ 900 |  |  |  |  |
Tractors [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years | 5 years |  |  |  |
Property, Plant, and Equipment, Salvage Value |  |  | 10.00% | 25.00% | 10.00% |  |  |
Trailers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years | 7 years |  |  |  |
FSA [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  | $ 890 |  |  |  |  |
Period of years which earnout is calculated |  | 2 years |  |  |  |  |  |
Business Acquisition, Cash Paid |  | $ 27,000 |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  | 15,000 |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Current |  | 10,321 | 11,211 |  | $ 11,211 |  |  |
Expected future contingent consideration liability |  |  | 12,600 |  | 12,600 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 202 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | 1,491 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 40 |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  | 3,209 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets |  | 4,942 |  |  |  |  |  |
Carrying value of goodwill |  | 19,281 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 37,281 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 42,223 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  | 7,664 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities |  | 4,350 |  |  |  |  |  |
Operating Lease, Liability |  | 3,209 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 15,223 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | $ 27,000 |  |  |  |  |  |
OST [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid | $ 12,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 10,604 |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | 1,672 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets | 12,276 |  |  |  |  |  |  |
Carrying value of goodwill | 2,050 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 8,600 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 20,876 |  |  |  |  |  |  |
Finance Lease, Liability | 7,204 |  |  |  |  |  |  |
Operating Lease, Liability | 1,672 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 8,876 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 12,000 |  |  |  |  |  |  |
Southwest Freight Distributors [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  |  | $ 16,250
Expedited LTL [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Carrying value of goodwill |  |  | 116,874 |  | 116,874 |  | 97,593 |
Intermodal [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Carrying value of goodwill |  |  | 78,665 |  | 78,665 |  | 76,615 |
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) |
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) |
Noncompete Agreements [Member] | FSA [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 |  | $ 900 |  |  |  |  |  |
Noncompete Agreements [Member] | OST [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 850 |  |  |  |  |  |  |
Customer Relationships [Member] | FSA [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 |  | $ 17,100 |  |  |  |  |  |
Customer Relationships [Member] | OST [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 5,700 |  |  |  |  |  |  |
Risk Free Interest Rate [Member] | FSA [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage |  | 2.40% |  |  |  |  |  |
Revenue Discount Rate [Member] | FSA [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage |  | 8.50% |  |  |  |  |  |
Revenue Volatility [Member] | FSA [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input Percentage |  | 9.00% |  |  |  |  |  |

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