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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Investment Company, Net Assets [Roll Forward]    
Beginning of the period (in shares) 102,558,859  
Beginning of the period $ 1,331,723 $ 1,326,191
Issuances of common stock 47,919 0
Offering costs (81) (56)
Distributions declared (38,462) (32,453)
Net increase (decrease) in net assets resulting from operations $ 28,084 44,812
End of the period (in shares) 106,289,293  
Ending of the period $ 1,369,183 1,338,494
Total Net Assets of NMFC    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period 1,319,951 1,314,473
Issuances of common stock 47,919 0
Offering costs (81) (56)
Distributions declared (38,265) (32,300)
Net increase (decrease) in net assets resulting from operations 27,408 44,573
Ending of the period $ 1,356,932 $ 1,326,690
Common Stock    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period (in shares) 102,558,859 100,937,026
Beginning of the period $ 1,026 $ 1,009
Issuances of common stock (in shares) 3,730,434 0
Issuances of common stock $ 37 $ 0
End of the period (in shares) 106,289,293 100,937,026
Ending of the period $ 1,063 $ 1,009
Paid in Capital in Excess of Par    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period 1,331,269 1,305,945
Issuances of common stock 47,882 0
Offering costs (81) (56)
Ending of the period 1,379,070 1,305,889
Accumulated Net Investment Income    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period 150,407 147,593
Distributions declared (38,265) (32,300)
Net increase (decrease) in net assets resulting from operations 37,325 38,113
Ending of the period 149,467 153,406
Accumulated Net Realized (Losses) Gains    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period (100,015) (68,072)
Net increase (decrease) in net assets resulting from operations (11,830) 677
Ending of the period (111,845) (67,395)
Net Unrealized Appreciation (Depreciation)    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period (62,736) (72,002)
Net increase (decrease) in net assets resulting from operations 1,913 5,783
Ending of the period (60,823) (66,219)
Non-Controlling Interest in NMNLC    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period 11,772 11,718
Distributions declared (197) (153)
Net increase (decrease) in net assets resulting from operations 676 239
Ending of the period $ 12,251 $ 11,804