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Acquisitions, Goodwill and Other Long-Lived Assets (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 28, 2018 | Jul. 25, 2018 | Oct. 22, 2017 | May 07, 2017 | Aug. 29, 2016 | Jan. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  |  |  |  |  | $ 16,501 | $ 16,501 |  |  |  |  |  |  |
Goodwill, Net | $ 199,092 |  |  |  | $ 191,671 |  |  |  | 199,092 | 191,671 |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  | 19,987 | 23,140 | $ 11,800 |  |  |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 61 |  |  |  | 105 |  |  |  | 61 | 105 |  |  |  |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 143 |  |  |  | 201 |  |  |  | 143 | 201 |  |  |  |  |  |  |
Operating Income (Loss) | 35,047 | $ 29,879 | $ 32,870 | $ 24,235 | 27,843 | $ 27,176 | $ 29,996 | $ 23,743 | 122,031 | 108,757 | 59,703 |  |  |  |  |  |
Net income (loss) | $ 27,684 | $ 22,329 | $ 24,298 | $ 17,741 | $ 34,681 | $ 18,328 | $ 19,666 | $ 14,581 | $ 92,051 | $ 87,255 | $ 27,505 |  |  |  |  |  |
Basic (in dollars per share) | $ 0.95 | $ 0.76 | $ 0.83 | $ 0.60 | $ 1.17 | $ 0.61 | $ 0.65 | $ 0.48 | $ 3.14 | $ 2.90 | $ 0.90 |  |  |  |  |  |
Diluted (in dollars per share) | $ 0.95 | $ 0.76 | $ 0.82 | $ 0.60 | $ 1.16 | $ 0.61 | $ 0.65 | $ 0.48 | $ 3.12 | $ 2.89 | $ 0.90 |  |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  |  |  |  |  | $ 16,501 | $ 16,501 |  |  |  |  |  |  |
Atlantic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,500 |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 135 |  |  |  |  |  |  |  | $ 135 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,269 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,090 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 590 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 590 |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,500 |  |
Atlantic [Member] | Noncompete Agreements [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 |  |
Atlantic [Member] | Customer Relationships [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 |  |
Atlantic [Member] | Goodwill [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,719 |  |
KCL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 640 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 223 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 223 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  | 517 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 740 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 640 |  |  |
KCL [Member] | Noncompete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |
KCL [Member] | Customer Relationships [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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 234 |  |  |
KCL [Member] | Goodwill [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  | 277 |  |  |
MMT [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net | 1,954 |  |  |  |  |  |  |  | $ 1,954 |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,737 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  |  | 81 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets |  |  |  |  |  |  |  |  |  |  |  |  | 81 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | 3,656 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Assets |  |  |  |  |  |  |  |  |  |  |  |  | 3,737 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets |  |  |  |  |  |  |  |  |  |  |  |  | 3,737 |  |  |  |
MMT [Member] | Noncompete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 43 |  |  |  |
MMT [Member] | Customer Relationships [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 |  |  |  |  |  |  |  |  |  |  |  |  | 1,659 |  |  |  |
MMT [Member] | Goodwill [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,954 |  |  |  |
Triumph & Ace [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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, Net 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 & Ace [Member] | Noncompete Agreements [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 |
Triumph & Ace [Member] | Customer Relationships [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 |
Triumph & Ace [Member] | Goodwill [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,282 |
Ace [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700
Triumph [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,100 |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250 |
Southwest Freight Distributors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Net | $ 5,467 |  |  |  |  |  |  |  | $ 5,467 |  |  |  |  |  |  |  |
Business Acquisition, Cash Paid |  |  |  |  |  |  |  |  |  |  |  | $ 16,250 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  | 933 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Total Tangible Assets |  |  |  |  |  |  |  |  |  |  |  | 933 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  | 15,317 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Assets |  |  |  |  |  |  |  |  |  |  |  | 16,250 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Total Liabilities Assumed, Net Total Assets |  |  |  |  |  |  |  |  |  |  |  | 16,250 |  |  |  |  |
Southwest Freight Distributors [Member] | Noncompete Agreements [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 |  |  |  |  |  |  |  |  |  |  |  | 650 |  |  |  |  |
Southwest Freight Distributors [Member] | Customer Relationships [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 |  |  |  |  |  |  |  |  |  |  |  | 9,200 |  |  |  |  |
Southwest Freight Distributors [Member] | Goodwill [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  | $ 5,467 |  |  |  |  |
KCL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |

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- Definition The amount of acquisition cost of a business combination allocated to net assets. + References No definition available. + Details
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- Definition Amount of total tangible assets acquired at the acquisition date. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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