GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS - SUMMARY OF INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Cost	$ 32,238	$ 30,418
Accumulated Amortization	(17,507)	(13,160)
Identifiable Intangible Assets, Net	14,731	17,258
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Cost	8,818	6,900
Accumulated Amortization	(652)	(338)
Identifiable Intangible Assets, Net	8,166	6,562
AMA
Finite-Lived Intangible Assets [Line Items]
Gross Cost	19,200	19,200
Accumulated Amortization	(16,640)	(12,800)
Identifiable Intangible Assets, Net	2,560	6,400
Annadale
Finite-Lived Intangible Assets [Line Items]
Gross Cost	4,220	4,318
Accumulated Amortization	(215)	(22)
Identifiable Intangible Assets, Net	$ 4,005	$ 4,296