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COMMITMENTS AND CONTINGENCIES - Litigation and Contingencies (Details) $ in Millions				12 Months Ended
	Apr. 10, 2018 USD ($)	Mar. 22, 2018 USD ($)	Jan. 15, 2016 USD ($)	Dec. 31, 2018 USD ($) lawsuit
Loss Contingencies [Line Items]
Ongoing lawsuits | lawsuit				6
Damages awarded to other party			$ 8.2
Damages awarded from other party		$ 8.9
Awarded judgment interests and costs	$ 0.4
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Civil penalty				$ 1.9

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Loss Contingency, Damages Awarded, Judgment And Interest Costs, Value

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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