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Investments - Investment Cost and Fair Value by Type and by Industry (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Cost | $ 3,101,924 | $ 3,038,208
Fair Value | 3,091,024 | 3,011,322
Software |  |
Schedule of Investments [Line Items] |  |
Cost | 857,673 | 815,065
Fair Value | 848,086 | 809,401
Healthcare |  |
Schedule of Investments [Line Items] |  |
Cost | 513,429 | 516,086
Fair Value | 501,850 | 477,854
Business Services |  |
Schedule of Investments [Line Items] |  |
Cost | 508,536 | 561,492
Fair Value | 497,954 | 539,926
Investment Funds (includes investments in joint ventures) |  |
Schedule of Investments [Line Items] |  |
Cost | 275,632 | 252,400
Fair Value | 275,632 | 252,400
Consumer Services |  |
Schedule of Investments [Line Items] |  |
Cost | 192,052 | 192,796
Fair Value | 192,340 | 192,501
Education |  |
Schedule of Investments [Line Items] |  |
Cost | 205,283 | 188,851
Fair Value | 187,620 | 211,550
Financial Services |  |
Schedule of Investments [Line Items] |  |
Cost | 120,505 | 104,330
Fair Value | 125,750 | 105,138
Distribution & Logistics |  |
Schedule of Investments [Line Items] |  |
Cost | 119,947 | 118,212
Fair Value | 120,493 | 110,721
Net Lease |  |
Schedule of Investments [Line Items] |  |
Cost | 81,370 | 95,782
Fair Value | 114,794 | 118,407
Packaging |  |
Schedule of Investments [Line Items] |  |
Cost | 68,200 | 43,181
Fair Value | 68,093 | 36,007
Energy |  |
Schedule of Investments [Line Items] |  |
Cost | 68,114 | 61,108
Fair Value | 65,076 | 65,170
Food & Beverage |  |
Schedule of Investments [Line Items] |  |
Cost | 38,840 | 20,370
Fair Value | 42,450 | 22,055
Business Products |  |
Schedule of Investments [Line Items] |  |
Cost | 22,185 | 22,630
Fair Value | 22,387 | 22,628
Consumer Products |  |
Schedule of Investments [Line Items] |  |
Cost | 20,769 | 20,576
Fair Value | 19,101 | 19,112
Specialty Chemicals & Materials |  |
Schedule of Investments [Line Items] |  |
Cost | 9,389 | 25,329
Fair Value | 9,398 | 28,452
First lien |  |
Schedule of Investments [Line Items] |  |
Cost | 1,970,251 | 1,709,247
Fair Value | 1,956,608 | 1,683,952
Second lien |  |
Schedule of Investments [Line Items] |  |
Cost | 211,449 | 472,930
Fair Value | 197,050 | 424,513
Subordinated |  |
Schedule of Investments [Line Items] |  |
Cost | 113,928 | 100,236
Fair Value | 102,034 | 90,948
Structured Finance Obligations |  |
Schedule of Investments [Line Items] |  |
Cost | 3,232 |
Fair Value | 3,232 |
Equity and other |  |
Schedule of Investments [Line Items] |  |
Cost | 803,064 | 755,795
Fair Value | $ 832,100 | $ 811,909

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