BORROWINGS (Senior Secured Financing Facility) (Details) - USD ($) $ in Thousands		1 Months Ended
	Jul. 31, 2020	Dec. 31, 2022	Jun. 30, 2024	Dec. 31, 2023	Aug. 16, 2021
Debt Instrument [Line Items]
Face amount of debt issued			$ 288,058	$ 271,942
Debt instrument, interest rate, stated percentage					5.75%
Loan and Servicing Agreement | Senior Secured Financing Facility
Debt Instrument [Line Items]
Debt instrument, commitment period of each loan series		3 months
Debt instrument, final maturity period of each loan series		5 years
Loan and Servicing Agreement | Maximum | Senior Secured Financing Facility
Debt Instrument [Line Items]
Face amount of debt issued		$ 500,000
Loan and Servicing Agreement | MassMutual and Other Lenders | Senior Secured Financing Facility
Debt Instrument [Line Items]
Face amount of debt issued	$ 250,000
Debt instrument, interest rate, stated percentage	5.75%
Loan and Servicing Agreement | MassMutual and Other Lenders | If Borrower Obtains Rating of BBB or Higher by October 31, 2020 | Senior Secured Financing Facility
Debt Instrument [Line Items]
Debt instrument, maturity date	Jul. 31, 2027