DEBT - Schedule of outstanding balances and total commitments under Financing Agreements (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding Balance	$ 953,153,000	$ 960,231,000
Total Commitment	1,535,000,000	1,535,000,000
Secured term loan
Debt Instrument [Line Items]
Outstanding Balance	150,000,000	150,000,000
Total Commitment	150,000,000	150,000,000
Wells Fargo Facility | Revolving credit facility, optional commitment amount
Debt Instrument [Line Items]
Total Commitment	500,000,000
Secured funding facility
Debt Instrument [Line Items]
Outstanding Balance	698,153,000	705,231,000
Total Commitment	1,280,000,000	1,280,000,000
Secured funding facility | Wells Fargo Facility
Debt Instrument [Line Items]
Outstanding Balance	261,039,000	270,798,000
Total Commitment	450,000,000	450,000,000
Secured funding facility | Citibank Facility
Debt Instrument [Line Items]
Outstanding Balance	236,240,000	236,240,000
Total Commitment	325,000,000	325,000,000
Secured funding facility | CNB Facility
Debt Instrument [Line Items]
Outstanding Balance	0	0
Total Commitment	75,000,000	75,000,000
Secured funding facility | MetLife Facility
Debt Instrument [Line Items]
Outstanding Balance	0	0
Total Commitment	180,000,000	180,000,000
Secured funding facility | Morgan Stanley Facility
Debt Instrument [Line Items]
Outstanding Balance	200,874,000	198,193,000
Total Commitment	250,000,000	250,000,000
Notes Payable
Debt Instrument [Line Items]
Outstanding Balance	105,000,000	105,000,000
Total Commitment	$ 105,000,000	$ 105,000,000