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Investments - Investments By Geographic Region (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Consolidated Schedule of Investments    
Investments, amortized cost $ 2,301,834 $ 2,419,938
Percentage of Total Portfolio 100.00% 100.00%
Market Value $ 2,298,343 $ 2,386,977
Percentage of Total Portfolio 100.00% 100.00%
United States    
Consolidated Schedule of Investments    
Investments, amortized cost $ 2,025,572 $ 2,113,220
Percentage of Total Portfolio 88.00% 87.30%
Market Value $ 1,998,863 $ 2,076,143
Percentage of Total Portfolio 87.10% 87.00%
Cayman Islands    
Consolidated Schedule of Investments    
Investments, amortized cost $ 124,504 $ 116,023
Percentage of Total Portfolio 5.40% 4.80%
Market Value $ 133,072 $ 118,535
Percentage of Total Portfolio 5.80% 5.00%
United Kingdom    
Consolidated Schedule of Investments    
Investments, amortized cost $ 40,119 $ 54,510
Percentage of Total Portfolio 1.70% 2.30%
Market Value $ 39,035 $ 52,633
Percentage of Total Portfolio 1.70% 2.20%
Belgium    
Consolidated Schedule of Investments    
Investments, amortized cost $ 39,439 $ 14,126
Percentage of Total Portfolio 1.70% 0.60%
Market Value $ 53,619 $ 18,779
Percentage of Total Portfolio 2.30% 0.80%
Australia    
Consolidated Schedule of Investments    
Investments, amortized cost $ 23,550 $ 50,981
Percentage of Total Portfolio 1.00% 2.10%
Market Value $ 27,007 $ 51,947
Percentage of Total Portfolio 1.20% 2.20%
Germany    
Consolidated Schedule of Investments    
Investments, amortized cost $ 24,677 $ 17,608
Percentage of Total Portfolio 1.10% 0.70%
Market Value $ 23,326 $ 17,882
Percentage of Total Portfolio 1.00% 0.70%
Ireland    
Consolidated Schedule of Investments    
Investments, amortized cost $ 9,394 $ 19,186
Percentage of Total Portfolio 0.40% 0.80%
Market Value $ 10,001 $ 17,779
Percentage of Total Portfolio 0.40% 0.70%
Luxembourg    
Consolidated Schedule of Investments    
Investments, amortized cost $ 8,145 $ 8,131
Percentage of Total Portfolio 0.40% 0.30%
Market Value $ 7,512 $ 7,285
Percentage of Total Portfolio 0.30% 0.30%
Netherlands    
Consolidated Schedule of Investments    
Investments, amortized cost   $ 51
Percentage of Total Portfolio   0.00%
Market Value   $ 51
Percentage of Total Portfolio   0.00%
Canada    
Consolidated Schedule of Investments    
Investments, amortized cost $ 5,844 $ 19,004
Percentage of Total Portfolio 0.30% 0.80%
Market Value $ 5,340 $ 18,754
Percentage of Total Portfolio 0.20% 0.80%
Guernsey    
Consolidated Schedule of Investments    
Investments, amortized cost $ 404 $ 6,573
Percentage of Total Portfolio 0.00% 0.30%
Market Value $ 411 $ 6,687
Percentage of Total Portfolio 0.00% 0.30%
Sweden    
Consolidated Schedule of Investments    
Investments, amortized cost $ 186 $ 185
Percentage of Total Portfolio 0.00% 0.00%
Market Value $ 157 $ 158
Percentage of Total Portfolio 0.00% 0.00%
Israel    
Consolidated Schedule of Investments    
Investments, amortized cost   $ 340
Percentage of Total Portfolio   0.00%
Market Value   $ 344
Percentage of Total Portfolio   0.00%