BORROWINGS - Components of Interest Expense - Notes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Line of Credit Facility [Line Items]
Amortization of deferred financing costs and debt issuance costs			$ 1,018	$ 588
Cash paid for interest expense and credit facility fees			32,064	33,954
Senior notes
Line of Credit Facility [Line Items]
Interest expense	$ 4,035	$ 2,209	8,069	4,418
Amortization of deferred financing costs and debt issuance costs	204	35	424	69
Total interest expense and credit facility fees	4,239	2,244	8,493	4,487
Cash paid for interest expense and credit facility fees	1,844	2,209	6,101	4,418
Weighted average debt principal outstanding	$ 275,000	$ 190,000	$ 275,000	$ 190,000
Weighted average interest rate	5.80%	4.65%	5.80%	4.65%
Secured debt | 2015-1R Notes
Line of Credit Facility [Line Items]
Interest expense	$ 7,639	$ 7,986	$ 15,739	$ 15,341
Amortization of deferred financing costs and debt issuance costs	63	62	124	124
Total interest expense and credit facility fees	7,702	8,048	15,863	15,465
Cash paid for interest expense and credit facility fees	7,924	7,498	16,518	14,384
Weighted average debt principal outstanding	$ 404,260	$ 449,200	$ 417,011	$ 449,200
Weighted average interest rate	7.54%	7.09%	7.52%	6.85%