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INCOME TAXES (Tax Reform Act) (Details) - USD ($) $ in Millions | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 28, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017
Impact of Tax Reform Act |  |  |  |  |  |  |  |
Statutory federal rate (as a percent) | 32.74% |  | 21.00% |  | 21.00% | 21.00% | 21.00% | 35.00%
Reduction of deferred tax liabilities due to Tax Reform Act |  |  |  | $ 0.1 |  |  | $ 2.6 | $ 24.5
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 rate (as a percent) |  | 27.40% |  | (68.00%) |  | 27.10% | (15.00%) |
Provisional reduction in current income tax expense due Tax Reform Act reflecting use of fiscal year rather than calendar year federal income tax filing |  |  |  |  |  |  | $ 0.1 | 1.3
Alternative fuel tax credit |  |  |  |  |  |  |  | $ 1.2

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