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Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost $ 3,168,719 [1] $ 3,259,967 [2]
Investments at fair value 3,111,903 [1] 3,221,247 [2]
Total assets 3,279,586 3,354,927
Deferred financing costs, accumulated amortization 52,507 47,531
Deferred financing costs (net of accumulated amortization) (13,515) (17,199)
Payable for unsettled securities purchased 4,678 0
Total liabilities 1,942,892 2,028,736
Total liabilities and net assets 3,279,586 3,354,927
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 670,979 681,288
Investments at fair value 656,828 639,327
Receivable from unsettled securities sold 3,645 0
Cash and other assets 21,716 17,149
Total assets 682,189 656,476
Credit facility 480,000 512,100
Deferred financing costs, accumulated amortization 5,532 4,840
Deferred financing costs (net of accumulated amortization) (1,060) (1,695)
Payable for unsettled securities purchased 27,023 0
Distribution payable 6,125 5,688
Other liabilities 7,829 6,492
Total liabilities 519,917 522,585
Members' capital 162,272 133,891
Total liabilities and net assets 682,189 656,476
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 505,873 504,875
Investments at fair value 494,851 473,762
Receivable from unsettled securities sold 5,275 0
Cash and other assets 16,139 12,853
Total assets 516,265 486,615
Credit facility 352,637 365,537
Deferred financing costs, accumulated amortization 1,447 997
Deferred financing costs (net of accumulated amortization) (1,566) (2,008)
Payable for unsettled securities purchased 20,346 0
Distribution payable 4,648 4,648
Other liabilities 6,641 5,410
Total liabilities 382,706 373,587
Members' capital 133,559 113,028
Total liabilities and net assets $ 516,265 $ 486,615
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.