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INVESTMENTS - Schedule of Composition of Investment Portfolio at Cost And Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024		Dec. 31, 2023
Schedule of Investments [Line Items]
Cost	$ 2,551,299		$ 2,535,576
Fair Value	$ 2,527,537		$ 2,488,715
Percentage of Total Net Assets	208.60%	[1]	208.00%
Jocassee Partners LLC
Schedule of Investments [Line Items]
Fair Value	$ 1,240,745		$ 1,315,630
Sierra JV
Schedule of Investments [Line Items]
Cost	51,269		85,304
Fair Value	50,361		79,599
Thompson Rivers LLC
Schedule of Investments [Line Items]
Cost	328,095		386,657
Fair Value	$ 307,685		$ 366,731
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Sierra JV
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Senior debt and 1st lien notes
Schedule of Investments [Line Items]
Cost	$ 1,699,117		$ 1,705,353
Fair Value	$ 1,658,742		$ 1,670,300
Percentage of Total Net Assets	137.00%		140.00%
Senior debt and 1st lien notes | Jocassee Partners LLC
Schedule of Investments [Line Items]
Cost	$ 1,217,642		$ 1,284,098
Fair Value	1,188,239		1,260,183
Senior debt and 1st lien notes | Sierra JV
Schedule of Investments [Line Items]
Cost	51,269		85,304
Fair Value	$ 50,361		$ 79,599
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	67.00%		67.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	93.00%		93.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Sierra JV
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	66.00%		67.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	95.00%		95.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Subordinated debt and 2nd lien notes
Schedule of Investments [Line Items]
Cost	$ 260,225		$ 256,850
Fair Value	$ 246,902		$ 238,215
Percentage of Total Net Assets	21.00%		20.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC
Schedule of Investments [Line Items]
Cost	$ 21,207		$ 21,728
Fair Value	$ 21,244		$ 21,262
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	10.00%		10.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	2.00%		2.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	10.00%		10.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	2.00%		2.00%
Structured products
Schedule of Investments [Line Items]
Cost	$ 105,043		$ 107,314
Fair Value	$ 95,131		$ 93,038
Percentage of Total Net Assets	8.00%		8.00%
Structured products | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	4.00%		4.00%
Structured products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	4.00%		4.00%
Equity shares
Schedule of Investments [Line Items]
Cost	$ 343,533		$ 320,335
Fair Value	$ 413,482		$ 374,704
Percentage of Total Net Assets	34.00%		31.00%
Equity shares | Jocassee Partners LLC
Schedule of Investments [Line Items]
Cost	$ 449		$ 449
Fair Value	$ 244		$ 268
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	13.00%		13.00%
Equity shares | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	16.00%		15.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Equity warrants
Schedule of Investments [Line Items]
Cost	$ 129		$ 76
Fair Value	$ 2,586		$ 2,392
Percentage of Total Net Assets	0.00%		0.00%
Equity warrants | Jocassee Partners LLC
Schedule of Investments [Line Items]
Cost	$ 0		$ 0
Fair Value	$ 468		$ 467
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Equity warrants | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	0.00%		0.00%
Investment in joint ventures / PE fund
Schedule of Investments [Line Items]
Cost	$ 143,252		$ 145,648
Fair Value	$ 110,694		$ 110,066
Percentage of Total Net Assets	9.00%		9.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	6.00%		6.00%
Investment in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Schedule of Investments [Line Items]
Percentage of Total Portfolio	4.00%		4.00%
Investment in joint ventures | Jocassee Partners LLC
Schedule of Investments [Line Items]
Cost	$ 51,339		$ 54,563
Fair Value	$ 30,550		$ 33,450
Investment in joint ventures | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	4.00%		4.00%
Investment in joint ventures | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	2.00%		2.00%
Short-term investments | Jocassee Partners LLC
Schedule of Investments [Line Items]
Cost	$ 12,954		$ 14,896
Fair Value	$ 12,954		$ 14,896
Short-term investments | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	1.00%		1.00%
Short-term investments | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	1.00%		1.00%
Long-Term Investments | Jocassee Partners LLC
Schedule of Investments [Line Items]
Cost	$ 1,303,591		$ 1,375,734
Fair Value	$ 1,253,699		$ 1,330,526
Long-Term Investments | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Long-Term Investments | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	100.00%		100.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC
Schedule of Investments [Line Items]
Cost	$ 306,491		$ 360,847
Fair Value	$ 287,390		$ 342,240
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	93.00%		93.00%
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	93.00%		93.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC
Schedule of Investments [Line Items]
Cost	$ 21,604		$ 25,810
Fair Value	$ 20,295		$ 24,491
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio, at Cost | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	7.00%		7.00%
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Schedule of Investments [Line Items]
Percentage of Total Portfolio	7.00%		7.00%
[1] Fair value as a percentage of net assets.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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