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INCOME TAXES (Tax Reform Act) (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2018 | Feb. 28, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Impact of Tax Reform Act |  |  |  |  |
Statutory federal rate (as a percent) |  | 32.74% | 21.00% |  | 35.00%
Projected combined tax rate based on federal statutory rate and applicable state tax rates (as a percent) | $ 25.80 |  |  |  |
Provisional reduction of deferred tax liabilities due to Tax Reform Act |  |  | $ 2,600,000 |  | $ 24,500,000
State tax, low end of range of rate (as a percent) |  |  | 6.00% |  |
State tax, high end of range of rate (as a percent) |  |  | 6.50% |  |
Effective tax benefit rate (as a percent) |  |  | 10.70% | 41.40% |
Provisional reduction in current income tax expense due Tax Reform Act reflecting use of fiscal year rather than calendar year federal income tax filing |  |  |  |  | $ 1,300,000
Alternative fuel tax credit |  |  | $ 1,200,000 |  |

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