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Investments - Investment Cost and Fair Value by Type and by Industry (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Cost $ 3,092,943 $ 3,101,924
Fair Value 3,034,211 3,091,024
Software    
Schedule of Investments [Line Items]    
Cost 843,518 857,673
Fair Value 835,189 848,086
Healthcare    
Schedule of Investments [Line Items]    
Cost 535,646 513,429
Fair Value 529,371 501,850
Business Services    
Schedule of Investments [Line Items]    
Cost 500,719 508,536
Fair Value 445,593 497,954
Investment Funds (includes investments in joint ventures)    
Schedule of Investments [Line Items]    
Cost 275,632 275,632
Fair Value 275,632 275,632
Consumer Services    
Schedule of Investments [Line Items]    
Cost 188,708 192,052
Fair Value 188,503 192,340
Education    
Schedule of Investments [Line Items]    
Cost 197,890 205,283
Fair Value 176,319 187,620
Financial Services    
Schedule of Investments [Line Items]    
Cost 120,261 120,505
Fair Value 125,472 125,750
Distribution & Logistics    
Schedule of Investments [Line Items]    
Cost 119,441 119,947
Fair Value 119,128 120,493
Net Lease    
Schedule of Investments [Line Items]    
Cost 81,370 81,370
Fair Value 114,521 114,794
Packaging    
Schedule of Investments [Line Items]    
Cost 68,471 68,200
Fair Value 68,856 68,093
Energy    
Schedule of Investments [Line Items]    
Cost 69,458 68,114
Fair Value 63,520 65,076
Food & Beverage    
Schedule of Investments [Line Items]    
Cost 39,073 38,840
Fair Value 42,345 42,450
Business Products    
Schedule of Investments [Line Items]    
Cost 22,134 22,185
Fair Value 22,331 22,387
Consumer Products    
Schedule of Investments [Line Items]    
Cost 21,090 20,769
Fair Value 17,844 19,101
Specialty Chemicals & Materials    
Schedule of Investments [Line Items]    
Cost 9,532 9,389
Fair Value 9,587 9,398
First lien    
Schedule of Investments [Line Items]    
Cost 1,975,174 1,970,251
Fair Value 1,959,038 1,956,608
Second lien    
Schedule of Investments [Line Items]    
Cost 186,274 211,449
Fair Value 173,598 197,050
Subordinated    
Schedule of Investments [Line Items]    
Cost 116,809 113,928
Fair Value 104,948 102,034
Structured Finance Obligations    
Schedule of Investments [Line Items]    
Cost 3,232 3,232
Fair Value 3,232 3,232
Equity and other    
Schedule of Investments [Line Items]    
Cost 811,454 803,064
Fair Value $ 793,395 $ 832,100