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LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS (Environmental Matters) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) tank state | Dec. 31, 2017 USD ($)
Underground fuel storage tanks |  |
Environmental Matters |  |
Number of underground tanks where the company's subsidiaries store fuel for use in tractors and trucks | tank | 62 |
Number of states in which underground tanks are located | state | 18 |
Environmental cleanup costs |  |
Environmental Matters |  |
Reserve for environmental contingencies | $ | $ 0.6 | $ 0.4

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