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RELATED PARTY TRANSACTIONS - Narrative (Details)						12 Months Ended
RELATED PARTY TRANSACTIONS - Narrative (Details)	May 09, 2022 day	Nov. 03, 2020 USD ($) loan	May 05, 2020 $ / shares shares	Jul. 01, 2018	Jun. 30, 2018	Dec. 31, 2022 USD ($) investment $ / shares	Dec. 31, 2021 USD ($) investment $ / shares	Dec. 31, 2020 USD ($) investment
Related Party Transaction [Line Items]
Base management and incentive fees payable						$ 12,681,000	$ 11,819,000
Proceeds from sales and repayments of investments and change in receivable for investments sold						578,321,000	849,039,000	$ 688,798,000
Proceeds from contribution of investments to Credit Fund II						$ 0	$ 0	168,897,000
Preferred stock, par value (in dollars per share) \| $ / shares						$ 0.01	$ 0.01
Credit Fund II
Related Party Transaction [Line Items]
Ownership interest		84.13%
Private placement
Related Party Transaction [Line Items]
Sale of stock, number of shares issued \| shares			2,000,000
Preferred stock, par value (in dollars per share) \| $ / shares			$ 0.01
Sale of stock, offering price (in dollars per share) \| $ / shares			$ 25
Debt securities \| Credit Fund II
Related Party Transaction [Line Items]
Number of loans \| loan		45
Par/principal amount		$ 250,000,000				$ 253,310,000	$ 240,878,000
Proceeds from contribution of investments to Credit Fund II		$ 170,000,000
Affiliated entity \| Private placement
Related Party Transaction [Line Items]
Sale of stock, number of shares issued \| shares			2,000,000
Preferred stock, par value (in dollars per share) \| $ / shares			$ 0.01
Sale of stock, offering price (in dollars per share) \| $ / shares			$ 25
Investment Advisory Agreement \| Affiliated entity
Related Party Transaction [Line Items]
Agreement period	1 year
Termination notice, number of written days notice threshold \| day	60
Base management fee rate					1.50%	1.00%
Quarterly hurdle rate \| Affiliated entity
Related Party Transaction [Line Items]
Incentive rate				1.50%
Annualized hurdle rate \| Affiliated entity
Related Party Transaction [Line Items]
Incentive rate				6.00%
Quarterly catch-up rate \| Affiliated entity
Related Party Transaction [Line Items]
Incentive rate				1.82%
Annualized catch-up rate \| Affiliated entity
Related Party Transaction [Line Items]
Incentive rate				7.28%
Pre-incentive fee net investment income, below catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive rate				100.00%
Pre-incentive fee net investment income, exceeds catch-up threshold \| Affiliated entity
Related Party Transaction [Line Items]
Incentive rate				17.50%
Realized capital gains incentive fees \| Affiliated entity
Related Party Transaction [Line Items]
Incentive rate				17.50%
Administration Agreement \| Affiliated entity
Related Party Transaction [Line Items]
Agreement period	1 year
Termination notice, number of written days notice threshold \| day	60
Related party expense						$ 1,636,000	1,338,000	679,000
Due to related party						1,711,000	482,000
State Street Sub-Administration Agreement \| Affiliated entity
Related Party Transaction [Line Items]
Agreement period	1 year
Termination notice, number of written days notice threshold \| day	60
Related party expense						807,000	684,000	659,000
Due to related party						298,000	682,000
Independent Directors' Services \| Independent directors
Related Party Transaction [Line Items]
Related party expense						640,000	561,000	$ 398,000
Due to related party						$ 0	$ 142,000
Investment Funds Transactions \| Limited Liability Company \| Credit Fund \| Investment Funds
Related Party Transaction [Line Items]
Number of investments sold \| investment						8	8	4
Proceeds from sales and repayments of investments and change in receivable for investments sold						$ 113,509,000	$ 118,204,000	$ 62,754,000
Gain (loss) on sale of investments						$ (439,000)	$ 1,075,000	$ (2,289,000)
Investment Funds Transactions \| Limited Liability Company \| Credit Fund II \| Investment Funds
Related Party Transaction [Line Items]
Number of investments sold \| investment						10	17	0
Proceeds from sales and repayments of investments and change in receivable for investments sold						$ 68,167,000	$ 84,554,000
Gain (loss) on sale of investments						$ (840,000)	$ 468,000
Underwriting services, 2020 Notes \| Affiliated entity
Related Party Transaction [Line Items]
Base management fee rate								0.75%