COMMITMENTS AND CONTINGENCIES - Loan Loss Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 33,591	$ 17,677	$ 18,301
Provision for loan loss obligations	7,185	25,973	8,673
Charge-offs	(10,899)	(10,059)	(9,297)
Balance at end of period	$ 29,877	$ 33,591	$ 17,677