Quarterly report pursuant to Section 13 or 15(d)

Investments - Schedule of Fair Value Portfolio of Investments by Asset Class (Details)

v3.23.1
Investments - Schedule of Fair Value Portfolio of Investments by Asset Class (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 3,130,178 $ 2,963,955
Senior Secured    
Schedule Of Investments [Line Items]    
Investments at Fair Value 2,910,526 2,741,388
Unsecured Debt    
Schedule Of Investments [Line Items]    
Investments at Fair Value 58,125 54,056
Investment Funds And Vehicles    
Schedule Of Investments [Line Items]    
Investments at Fair Value 3,900 3,893
Preferred Stock | Equity Investments [Member]    
Schedule Of Investments [Line Items]    
Investments at Fair Value 40,345 41,488
Common Stock | Equity Investments [Member]    
Schedule Of Investments [Line Items]    
Investments at Fair Value 84,072 92,484
Warrant | Warrant Investment [Member]    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 33,210 $ 30,646
Geographic Concentration Risk [Member] | Revenue Benchmark    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 100.00% 100.00%
Investment Type Concentration Risk | Revenue Benchmark    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 100.00% 100.00%
Investment Type Concentration Risk | Revenue Benchmark | Senior Secured    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 93.00% 92.50%
Investment Type Concentration Risk | Revenue Benchmark | Unsecured Debt    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 1.90% 1.80%
Investment Type Concentration Risk | Revenue Benchmark | Investment Funds And Vehicles    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 0.10% 0.10%
Investment Type Concentration Risk | Preferred Stock | Revenue Benchmark | Equity Investments [Member]    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 1.30% 1.40%
Investment Type Concentration Risk | Common Stock | Revenue Benchmark | Equity Investments [Member]    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 2.70% 3.10%
Investment Type Concentration Risk | Warrant | Revenue Benchmark | Warrant Investment [Member]    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 1.00% 1.10%