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LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS (Environmental Matters) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($) tank state
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 | Accrued expenses |
Environmental Matters |
Reserve for environmental contingencies | $ | $ 0.5

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