Quarterly report pursuant to Section 13 or 15(d)

Investments - Schedule of Fair Value Portfolio of Investments by Geographic Location (Details)

v3.23.1
Investments - Schedule of Fair Value Portfolio of Investments by Geographic Location (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
United States    
Schedule Of Investments [Line Items]    
Investments at Fair Value 2,829,873 2,670,520
United Kingdom    
Schedule Of Investments [Line Items]    
Investments at Fair Value 174,678 171,629
Netherlands    
Schedule Of Investments [Line Items]    
Investments at Fair Value 89,952 88,915
Canada    
Schedule Of Investments [Line Items]    
Investments at Fair Value 11,132 19,472
Israel    
Schedule Of Investments [Line Items]    
Investments at Fair Value 19,432 9,052
Denmark    
Schedule Of Investments [Line Items]    
Investments at Fair Value 3,739 0
Ireland    
Schedule Of Investments [Line Items]    
Investments at Fair Value 0 2,804
Germany    
Schedule Of Investments [Line Items]    
Investments at Fair Value 893 990
Other    
Schedule Of Investments [Line Items]    
Investments at Fair Value $ 479 $ 573
Geographic Concentration Risk [Member] | Revenue Benchmark    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 100.00% 100.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | United States    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 90.40% 90.10%
Geographic Concentration Risk [Member] | Revenue Benchmark | United Kingdom    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 5.60% 5.80%
Geographic Concentration Risk [Member] | Revenue Benchmark | Netherlands    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 2.90% 3.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | Canada    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 0.40% 0.70%
Geographic Concentration Risk [Member] | Revenue Benchmark | Israel    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 0.60% 0.30%
Geographic Concentration Risk [Member] | Revenue Benchmark | Denmark    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 0.10% 0.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | Ireland    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 0.00% 0.10%
Geographic Concentration Risk [Member] | Revenue Benchmark | Germany    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 0.00% 0.00%
Geographic Concentration Risk [Member] | Revenue Benchmark | Other    
Schedule Of Investments [Line Items]    
Concentration Risk, Percentage 0.00% 0.00%