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Investments - NMFC Senior Loan Program III LLC (Details)
$ in Thousands
 3 Months Ended
Jul. 03, 2024
Jun. 23, 2023
Mar. 31, 2025
USD ($)
investment
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
investment
Schedule of Investments [Line Items]          
Cost     $ 3,092,943   $ 3,101,924
Investments at fair value     3,034,211   3,091,024
Interest and dividend receivable     41,239   42,379
SLP III          
Schedule of Investments [Line Items]          
Cost     160,000    
Dividend income     5,800 $ 5,863  
Interest and dividend receivable     5,800   6,100
SLP III | SkyKnight II          
Schedule of Investments [Line Items]          
Cost     $ 40,000    
SLP III          
Schedule of Investments [Line Items]          
Investment period     5 years    
Investment extension period     1 year    
Cost     $ 697,918   716,654
Investments at fair value     $ 688,213   $ 715,096
Number of investments on non-accrual | investment     0   0
SLP III | Delayed Draw Term Loan (DDTL)          
Schedule of Investments [Line Items]          
Unfunded commitments principal amount     $ 4,909   $ 2,654
SLP III | Revolving Credit Facility          
Schedule of Investments [Line Items]          
Credit facility     477,700   $ 511,200
SLP III | Revolving Credit Facility | Credit Facility          
Schedule of Investments [Line Items]          
Maximum borrowing capacity     $ 600,000    
SLP III | During Reinvestment Period | Revolving Credit Facility | Credit Facility          
Schedule of Investments [Line Items]          
Interest rate margin 1.65% 1.80%      
SLP III | After Reinvestment Period | Revolving Credit Facility | Credit Facility          
Schedule of Investments [Line Items]          
Interest rate margin 1.95% 2.10%