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Investments - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023		Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Cost	$ 2,535,576	[1]	$ 2,562,398
Fair Value	$ 2,488,715	[1]	$ 2,448,935
Percent of Total Net Assets	208.00%	[1]	205.40%
Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Fair Value	$ 1,315,630		$ 1,209,063
Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	386,657		949,279
Fair Value	366,731		890,911
Sierra JV
Summary of Investment Holdings [Line Items]
Cost	85,304		125,220
Fair Value	$ 79,599		$ 110,047
Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Senior debt and 1st lien notes
Summary of Investment Holdings [Line Items]
Cost	$ 1,705,353		$ 1,752,943
Fair Value	$ 1,670,300		$ 1,696,192
Percent of Total Net Assets	140.00%		142.00%
Senior debt and 1st lien notes | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 1,284,098		$ 1,177,895
Fair Value	1,260,183		1,123,760
Senior debt and 1st lien notes | Sierra JV
Summary of Investment Holdings [Line Items]
Cost	85,304		125,220
Fair Value	$ 79,599		$ 110,047
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	67.00%		69.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	93.00%		91.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	67.00%		69.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	95.00%		92.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Sierra JV
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Subordinated debt and 2nd lien notes
Summary of Investment Holdings [Line Items]
Cost	$ 256,850		$ 326,639
Fair Value	$ 238,215		$ 263,139
Percent of Total Net Assets	20.00%		22.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 21,728		$ 23,141
Fair Value	$ 21,262		$ 21,659
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	10.00%		13.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	2.00%		2.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	10.00%		11.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	2.00%		2.00%
Structured Products
Summary of Investment Holdings [Line Items]
Cost	$ 107,314		$ 88,805
Fair Value	$ 93,038		$ 73,550
Percent of Total Net Assets	8.00%		6.00%
Structured Products | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	4.00%		3.00%
Structured Products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	4.00%		3.00%
Equity shares
Summary of Investment Holdings [Line Items]
Cost	$ 320,335		$ 230,188
Fair Value	$ 374,704		$ 284,570
Percent of Total Net Assets	31.00%		24.00%
Equity shares | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 449		$ 8,521
Fair Value	$ 268		$ 2,458
Equity shares | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	13.00%		9.00%
Equity shares | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%		0.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	15.00%		12.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%		0.00%
Equity warrants
Summary of Investment Holdings [Line Items]
Cost	$ 76		$ 178
Fair Value	$ 2,392		$ 1,057
Percent of Total Net Assets	0.00%		0.00%
Equity warrants | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 0		$ 31
Fair Value	$ 467		$ 158
Equity warrants | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%		0.00%
Equity warrants | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%		0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%		0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	0.00%		0.00%
Investments in joint ventures / PE fund
Summary of Investment Holdings [Line Items]
Cost	$ 145,648		$ 163,645
Fair Value	$ 110,066		$ 130,427
Percent of Total Net Assets	9.00%		11.00%
Investments in joint ventures / PE fund | Percentage of Total Portfolio | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	6.00%		6.00%
Investments in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	4.00%		5.00%
Investment in joint ventures | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 54,563		$ 75,941
Fair Value	$ 33,450		$ 61,028
Investment in joint ventures | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	4.00%		6.00%
Investment in joint ventures | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	2.00%		5.00%
Short-term investments | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 14,896		$ 10,826
Fair Value	$ 14,896		$ 10,826
Short-term investments | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	1.00%		1.00%
Short-term investments | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	1.00%		1.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	$ 360,847		$ 864,625
Fair Value	$ 342,240		$ 811,358
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	93.00%		91.00%
Federal Housing Administration (“FHA”) loans | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	93.00%		91.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Cost	$ 25,810		$ 84,654
Fair Value	$ 24,491		$ 79,553
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	7.00%		9.00%
Veterans Affairs (“VA”) loans | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	7.00%		9.00%
Long-Term Investment | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Cost	$ 1,375,734		$ 1,296,355
Fair Value	$ 1,330,526		$ 1,219,889
Long-Term Investment | Percentage of Total Portfolio | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
Long-Term Investment | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC
Summary of Investment Holdings [Line Items]
Percent of Total Portfolio	100.00%		100.00%
[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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