COMMITMENTS AND CONTINGENCIES - Loan Loss Obligation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 26,626	$ 25,430	$ 33,591	$ 17,677
Provision for loan losses	2,456	4,495	2,723	16,621
Payments, realized losses and other	(2,094)	(2,374)	(9,326)	(6,747)
Balance at end of period	$ 26,988	$ 27,551	$ 26,988	$ 27,551