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LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS (Details) (Environmental Matters, USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 state tank | Dec. 31, 2012
Environmental Matters |  |
Loss contingencies |  |
Number of underground tanks where the company's subsidiaries store fuel for use in tractors and trucks | 67 |
Number of states in which underground tanks are located | 22 |
Estimated environmental cleanup costs of properties currently or previously operated by the company | $ 1.0 | $ 0.9

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