GOODWILL (Summary of Goodwill) (Details) - USD ($)	3 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2017
Goodwill [Abstract]
Goodwill, impairment loss	$ (304,100,000)	$ (304,100,000)	$ (304,100,000)
Ending Balance	$ 0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration