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INCOME TAXES (Uncertain Tax Positions) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income taxes |  |  |  |
Reserve for uncertain tax positions |  | $ 1.0 |  | $ 0.7
Maximum |  |  |  |
Income taxes |  |  |  |
Reserve for uncertain tax positions | $ 0.1 |  | $ 0.1 |
Federal, Foreign, and State Jurisdictions | Maximum |  |  |  |
Income taxes |  |  |  |
Interest paid on income tax obligations |  | 0.1 | 0.1 | 0.1
Foreign | Maximum |  |  |  |
Income taxes |  |  |  |
Income tax accrued interest |  | 0.1 |  |
Federal |  |  |  |
Income taxes |  |  |  |
Reserve for uncertain tax positions |  |  |  | 0.7
Decrease in reserve, Expiration of statute of limitations | 0.7 |  |  |
Increase in reserve, Prior period tax positions |  | 0.9 |  |
Federal | 2015 tax year | Maximum |  |  |  |
Income taxes |  |  |  |
Reserve for uncertain tax positions | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1

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