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Acquisitions of Millis Transfer and Interstate Distributor Co. (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 26, 2019 | Jul. 06, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  | $ 500 |  | $ 900
Accounts and Other Receivables, Net, Current | $ 14,474 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 1,656 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 117,060 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 802 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 15,300 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill | 35,885 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 185,177 |  |  |  |
Self Insurance Reserve | 4,371 |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | 61,927 |  | $ 61,927 | $ 0 | 86,728
Accounts Payable and Accrued Liabilities | 31,737 |  |  |  |
Long-term Debt | 70,191 |  |  |  |
Business Combination, Total Consideration | 156,000 |  |  |  |
Business Combination, Cash and Equity Transferred | 62,677 |  |  |  |
Noncash or Part Noncash Acquisition, Debt Assumed | 93,300 |  |  |  |
Acquired Business Percent of Assets |  |  | 21.10% |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | 750 |  |  |  |
Deferred Taxes | $ 16,201 |  |  |  |
Debt, Long-term and Short-term, Combined Amount |  |  | $ 0 |  |
Acquired Business Percent of Revenue |  |  | 8.80% |  |
Payments to Acquire Businesses, Gross |  | $ 93,000 |  |  |
Cash Acquired from Acquisition |  | $ 6,300 |  |  |
Business Combination, Pro Forma Information, Net Income Change |  |  | $ 3,000 | 3,600 | 5,700
Business Acquisition, Pro Forma Revenue |  |  | 694,672 | 760,917 | 756,498
Business Acquisition, Pro Forma Net Income (Loss) |  |  | $ 75,951 | $ 76,259 | $ 72,752

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