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Investments - Geographic Investment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Cost $ 10,496,753 $ 9,934,159
Fair Value $ 10,439,173 $ 9,868,440
Percentage of Net Assets 202.40% 199.30%
Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 100.00% 100.00%
United States    
Schedule of Investments [Line Items]    
Cost $ 9,820,598 $ 9,381,707
Fair Value $ 9,774,947 $ 9,317,684
Percentage of Net Assets 189.60% 188.20%
United States | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 93.70% 94.40%
Canada    
Schedule of Investments [Line Items]    
Cost $ 274,055 $ 275,579
Fair Value $ 275,335 $ 278,103
Percentage of Net Assets 5.30% 5.60%
Canada | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 2.60% 2.80%
Bermuda/Cayman Islands    
Schedule of Investments [Line Items]    
Cost $ 436 $ 436
Fair Value $ 511 $ 473
Percentage of Net Assets 0.00% 0.00%
Bermuda/Cayman Islands | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.00% 0.00%
Europe    
Schedule of Investments [Line Items]    
Cost $ 401,025 $ 276,437
Fair Value $ 387,751 $ 272,180
Percentage of Net Assets 7.50% 5.50%
Europe | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 3.70% 2.80%
Asia    
Schedule of Investments [Line Items]    
Cost $ 639  
Fair Value $ 629  
Percentage of Net Assets 0.00%  
Asia | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
% of Total Investments at Fair Value 0.00%