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Investments - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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