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INVESTMENTS - Composition of Investment Portfolio At Cost And Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Summary of Investment Holdings [Line Items] |  |
Cost | $ 2,658,484 | $ 2,562,398
Fair Value | $ 2,556,114 | $ 2,448,935
% of Net Assets | 212.10% | 205.40%
Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 1,212,132 | $ 1,209,063
Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | 696,008 | 949,279
Fair Value | 664,111 | 890,911
Sierra JV |  |
Summary of Investment Holdings [Line Items] |  |
Cost | 119,673 | 125,220
Fair Value | $ 106,251 | $ 110,047
Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Cost | Investment Type Concentration Risk | Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Cost | Investment Type Concentration Risk | Sierra JV |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Fair Value | Investment Type Concentration Risk | Sierra JV |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Senior debt and 1st lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 1,813,687 | $ 1,752,943
Fair Value | $ 1,765,238 | $ 1,696,192
% of Net Assets | 146.00% | 142.00%
Senior debt and 1st lien notes | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 1,175,878 | $ 1,177,895
Fair Value | 1,133,366 | 1,123,760
Senior debt and 1st lien notes | Sierra JV |  |
Summary of Investment Holdings [Line Items] |  |
Cost | 119,673 | 125,220
Fair Value | $ 106,251 | $ 110,047
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 68.00% | 69.00%
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 92.00% | 91.00%
Senior debt and 1st lien notes | Cost | Investment Type Concentration Risk | Sierra JV |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 69.00% | 69.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 93.00% | 92.00%
Senior debt and 1st lien notes | Fair Value | Investment Type Concentration Risk | Sierra JV |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Subordinated debt and 2nd lien notes |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 318,480 | $ 326,639
Fair Value | $ 255,089 | $ 263,139
% of Net Assets | 21.00% | 22.00%
Subordinated debt and 2nd lien notes | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 24,151 | $ 23,141
Fair Value | $ 23,096 | $ 21,659
Subordinated debt and 2nd lien notes | Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 12.00% | 13.00%
Subordinated debt and 2nd lien notes | Cost | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 2.00% | 2.00%
Subordinated debt and 2nd lien notes | Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 10.00% | 11.00%
Subordinated debt and 2nd lien notes | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 2.00% | 2.00%
Structured products |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 96,896 | $ 88,805
Fair Value | $ 79,343 | $ 73,550
% of Net Assets | 7.00% | 6.00%
Structured products | Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 4.00% | 3.00%
Structured products | Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 3.00% | 3.00%
Equity shares |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 274,704 | $ 230,188
Fair Value | $ 331,880 | $ 284,570
% of Net Assets | 28.00% | 24.00%
Equity shares | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 8,555 | $ 8,521
Fair Value | $ 6,911 | $ 2,458
Equity shares | Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 10.00% | 9.00%
Equity shares | Cost | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Equity shares | Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 13.00% | 12.00%
Equity shares | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Equity warrants |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 178 | $ 178
Fair Value | $ 1,056 | $ 1,057
% of Net Assets | 0.00% | 0.00%
Equity warrants | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 31 | $ 31
Fair Value | $ 108 | $ 158
Equity warrants | Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Equity warrants | Cost | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Equity warrants | Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Equity warrants | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 0.00% | 0.00%
Investment in joint ventures / PE fund |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 154,539 | $ 163,645
Fair Value | $ 123,508 | $ 130,427
% of Net Assets | 10.00% | 11.00%
Investment in joint ventures / PE fund | Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 6.00% | 6.00%
Investment in joint ventures / PE fund | Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 5.00% | 5.00%
Federal Housing Administration (“FHA”) loans | Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 634,664 | $ 864,625
Fair Value | $ 605,542 | $ 811,358
Federal Housing Administration (“FHA”) loans | Cost | Investment Type Concentration Risk | Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 91.00% | 91.00%
Federal Housing Administration (“FHA”) loans | Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 91.00% | 91.00%
Veterans Affairs (“VA”) loans | Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 61,344 | $ 84,654
Fair Value | $ 58,569 | $ 79,553
Veterans Affairs (“VA”) loans | Cost | Investment Type Concentration Risk | Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 9.00% | 9.00%
Veterans Affairs (“VA”) loans | Fair Value | Investment Type Concentration Risk | Thompson Rivers LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 9.00% | 9.00%
Investment in joint ventures | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 63,690 | $ 75,941
Fair Value | $ 48,651 | $ 61,028
Investment in joint ventures | Cost | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 5.00% | 6.00%
Investment in joint ventures | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 4.00% | 5.00%
Short-Term Investments | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 9,946 | $ 10,826
Fair Value | $ 9,946 | $ 10,826
Short-Term Investments | Cost | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 1.00% | 1.00%
Short-Term Investments | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 1.00% | 1.00%
Short-term investments | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 1,282,251 | $ 1,296,355
Fair Value | $ 1,222,078 | $ 1,219,889
Short-term investments | Cost | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%
Short-term investments | Fair Value | Investment Type Concentration Risk | Jocassee Partners LLC |  |
Summary of Investment Holdings [Line Items] |  |
Percentage of Total Portfolio | 100.00% | 100.00%

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