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Investments - SLP's portfolio (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
Borrower
Dec. 31, 2022
USD ($)
Borrower
Concentration Risk [Line Items]    
Investments at fair value $ 2,298,343 $ 2,386,977
International Senior Loan Program, LLC    
Concentration Risk [Line Items]    
Investments at fair value 709,846 707,683
International Senior Loan Program, LLC | Investments Operations [Member] | Investment Concentration Risk [Member]    
Concentration Risk [Line Items]    
Investments at fair value $ 709,846 $ 707,683
Weighted average yield on investments 11.30% 9.30%
Number of borrowers in ISLP | Borrower 37 38
Unfunded commitments $ 11,496 $ 14,212
International Senior Loan Program, LLC | Investments Operations [Member] | Investment Concentration Risk [Member] | Largest Investee [Member]    
Concentration Risk [Line Items]    
Investments at fair value 47,432 46,687
International Senior Loan Program, LLC | Investments Operations [Member] | Investment Concentration Risk [Member] | Five Largest Investee [Member]    
Concentration Risk [Line Items]    
Investments at fair value $ 206,779 $ 197,270