GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS - SUMMARY OF INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Cost	$ 21,600	$ 33,600
Accumulated Amortization	(7,733)	(5,440)
Identifiable Intangible Assets, Net	13,867	28,160
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Cost	2,400	14,400
Accumulated Amortization	(53)	(2,880)
Identifiable Intangible Assets, Net	2,347	11,520
AMA
Finite-Lived Intangible Assets [Line Items]
Gross Cost	19,200	19,200
Accumulated Amortization	(7,680)	(2,560)
Identifiable Intangible Assets, Net	$ 11,520	$ 16,640