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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Investment Company, Net Assets [Roll Forward]                
Beginning of the period (in shares)     100,937,026       100,937,026  
Beginning of the period $ 1,337,962 $ 1,338,494 $ 1,326,191 $ 1,365,201 $ 1,367,840 $ 1,342,612 $ 1,326,191 $ 1,342,612
Issuances of common stock 6,625     2,955 16,577 21,572    
Offering costs (66) (91) (56) (34) (74) (52)    
Distributions declared (36,526) (35,519) (32,453) (30,538) (34,405) (33,339)    
Contributions related to non-controlling interest in NMNLC         123      
Net increase (decrease) in net assets resulting from operations $ 28,699 35,078 44,812 7,514 15,140 37,047 $ 108,589 59,701
End of the period (in shares) 101,439,649           101,439,649  
Ending of the period $ 1,336,694 1,337,962 1,338,494 1,345,098 1,365,201 1,367,840 $ 1,336,694 1,345,098
Total Net Assets of NMFC                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period 1,326,101 1,326,690 1,314,473 1,351,610 1,349,368 1,321,245 1,314,473 1,321,245
Issuances of common stock 6,625     2,955 16,577 21,572    
Offering costs (66) (91) (56) (34) (74) (52) (213) (160)
Distributions declared (36,338) (35,328) (32,300) (30,281) (30,215) (29,589) (103,966) (90,085)
Net increase (decrease) in net assets resulting from operations 28,696 34,830 44,573 7,705 15,954 36,192 108,099 59,851
Ending of the period $ 1,325,018 $ 1,326,101 $ 1,326,690 $ 1,331,955 $ 1,351,610 $ 1,349,368 $ 1,325,018 $ 1,331,955
Common Stock                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period (in shares) 100,937,026 100,937,026 100,937,026 100,716,928 99,498,562 97,907,441 100,937,026 97,907,441
Beginning of the period $ 1,009 $ 1,009 $ 1,009 $ 1,007 $ 995 $ 979 $ 1,009 $ 979
Issuances of common stock (in shares) 502,623     220,098 1,218,366 1,591,121    
Issuances of common stock $ 5     $ 2 $ 12 $ 16    
End of the period (in shares) 101,439,649 100,937,026 100,937,026 100,937,026 100,716,928 99,498,562 101,439,649 100,937,026
Ending of the period $ 1,014 $ 1,009 $ 1,009 $ 1,009 $ 1,007 $ 995 $ 1,014 $ 1,009
Paid in Capital in Excess of Par                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period 1,305,798 1,305,889 1,305,945 1,310,791 1,294,300 1,272,796 1,305,945 1,272,796
Issuances of common stock 6,620     2,953 16,565 21,556    
Offering costs (66) (91) (56) (34) (74) (52)    
Ending of the period 1,312,352 1,305,798 1,305,889 1,313,710 1,310,791 1,294,300 1,312,352 1,313,710
Accumulated Net Investment Income                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period 157,756 153,406 147,593 119,495 118,314 118,330 147,593 118,330
Distributions declared (36,338) (35,328) (32,300) (30,281) (30,215) (29,589)    
Net increase (decrease) in net assets resulting from operations 40,445 39,678 38,113 32,527 31,396 29,573    
Ending of the period 161,863 157,756 153,406 121,741 119,495 118,314 161,863 121,741
Accumulated Net Realized (Losses) Gains                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period (64,828) (67,395) (68,072) (59,654) (74,503) (92,099) (68,072) (92,099)
Net increase (decrease) in net assets resulting from operations 4,673 2,567 677 (390) 14,849 17,596    
Ending of the period (60,155) (64,828) (67,395) (60,044) (59,654) (74,503) (60,155) (60,044)
Net Unrealized Appreciation (Depreciation)                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period (73,634) (66,219) (72,002) (20,029) 10,262 21,239 (72,002) 21,239
Net increase (decrease) in net assets resulting from operations (16,422) (7,415) 5,783 (24,432) (30,291) (10,977)    
Ending of the period (90,056) (73,634) (66,219) (44,461) (20,029) 10,262 (90,056) (44,461)
Non-Controlling Interest in NMNLC                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period 11,861 11,804 11,718 13,591 18,472 21,367 11,718 21,367
Distributions declared (188) (191) (153) (257) (4,190) (3,750)    
Contributions related to non-controlling interest in NMNLC         123      
Net increase (decrease) in net assets resulting from operations 3 248 239 (191) (814) 855 490 (150)
Ending of the period $ 11,676 $ 11,861 $ 11,804 $ 13,143 $ 13,591 $ 18,472 $ 11,676 $ 13,143