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Acquisitions of Millis Transfer and Interstate Distributor Co. (Tables) | 12 Months Ended
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Dec. 31, 2019
Business Combinations [Abstract] |
Business Acquisition, Pro Forma Information [Text Block] |
| Year ended |  | Year ended
| December 31, 2019 |  | December 31, 2018
| (in thousands) |  |
Operating revenue | $694,672 |  | $760,917
Net income | $75,951 |  | $76,259
Business Acquisition ProForma Information |
| Year ended
| December 31, 2017
| (in thousands)
Operating revenue | $ | 756,498 |
Net income | $ | 72,752 |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
MILLIS TRANSFER ACQUISITION DATE FAIR MARKET VALUES | (in thousands)
Trade and other accounts receivable | $ | 14,474 |
Other current assets | 1,656 |
Property and equipment | 117,060 |
Other non-current assets | 802 |
Intangible assets | 15,300 |
Goodwill | 35,885 |
Total assets | 185,177 |
Accounts payable, accrued expenses, and current portion of long-term debt | (31,737) |
Insurance accruals | (4,371) |
Long-term debt | (70,191) |
Deferred taxes | (16,201) |
Total cash paid and common stock issued | $ | 62,677 |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] |
MILLIS TRANSFER TOTAL PURCHASE PRICE CONSIDERATION | (in thousands)
Cash paid pursuant to Stock Purchase Agreement | $ | 61,927 |
Common stock issued pursuant to the Acquisition and Merger Agreement | 750 |
Total cash paid and common stock issued | $ | 62,677 |

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + 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 -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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