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INCOME TAXES - Tax Reform (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income tax |  |
U.S. federal statutory rate |  | 35.00%
Surcharge on the U.S. federal tax rate |  | 10.00%
Percentage of expensing of certain qualified capital investments |  | 100.00%
Net impact of the 2017 Tax Act |  | $ 10.6
Percentage of tax on earnings in the form of cash and cash equivalents |  | 15.50%
Percentage of tax on earnings other than in the form of cash and cash equivalents |  | 8.00%
Accrued income tax liabilities under the transition toll tax |  | $ 7.4
Transition toll tax, expected to be paid within one year |  | $ 0.6
Transition toll tax, period |  | 8 years
Benefit on the remeasurement of the deferred tax assets and liabilities |  | $ 18.0
U.S. Virgin Islands |  |
Income tax |  |
U.S. federal statutory rate |  | 38.50%
Forecast |  |
Income tax |  |
U.S. federal statutory rate | 21.00% |
Forecast | U.S. Virgin Islands |  |
Income tax |  |
U.S. federal statutory rate | 23.10% |

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