GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS - SUMMARY OF CHANGES IN GOODWILL (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning Balance, January 1	$ 3,578	$ 4,838
Impairment of Goodwill	0	(1,260)
Goodwill from Acquisition	756,247	0
Fair Value Adjustments During Measurement Period	(25,218)	0
Ending Balance, December 31	$ 734,607	$ 3,578

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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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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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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