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Acquisition of Interstate Distributor Co. (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 06, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross | $ 93,044 |  |  |
Cash Acquired from Acquisition | 6,316 |  |  |
Business Combination, Acquisition Related Costs |  |  | $ 900 |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual, Percent |  |  | 5,700 | $ 3,900
Business Acquisition, Pro Forma Revenue |  |  | 756,498 | 938,007
Business Acquisition, Pro Forma Net Income (Loss) |  |  | 72,752 | 54,222
Payments to Acquire Intangible Assets | 6,316 |  |  |
Accounts and Other Receivables, Net, Current | 35,131 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 2,426 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 71,964 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 1,244 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 7,800 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 157,079 |  |  |
Self Insurance Reserve | 10,826 |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | 86,728 | $ 0 | $ 86,728 | $ 0
Accounts Payable and Accrued Liabilities | 35,209 |  |  |
Long-term Debt | 17,404 |  |  |
Business Combination, Consideration Transferred | 93,044 |  |  |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other | 596 |  |  |
Cash [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to Acquire Businesses, Gross | 93,000 |  |  |
Goodwill |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 32,198 |  |  |

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