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Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost $ 3,092,943 $ 3,101,924
Investments at fair value 3,034,211 3,091,024
Total assets 3,196,651 3,246,701
Deferred financing costs, accumulated amortization 66,182 63,971
Deferred financing costs (net of accumulated amortization) (23,343) (24,191)
Payable for unsettled securities purchased 12,022 0
Total liabilities 1,848,473 1,887,410
Total liabilities and net assets 3,196,651 3,246,701
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 697,918 716,654
Investments at fair value 688,213 715,096
Cash and other assets 24,858 20,988
Receivable from unsettled securities sold 14,241 9,652
Total assets 727,312 745,736
Deferred financing costs, accumulated amortization 6,827 6,515
Deferred financing costs (net of accumulated amortization) (3,380) (3,692)
Distribution payable 7,250 7,625
Payable for unsettled securities purchased 51,283 27,428
Other liabilities 7,132 7,493
Total liabilities 539,985 550,054
Members' capital 187,327 195,682
Total liabilities and net assets 727,312 745,736
SLP III | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility 477,700 511,200
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 460,308 474,738
Investments at fair value 451,133 469,326
Cash and other assets 32,585 15,401
Receivable from unsettled securities sold 17,224 7,232
Total assets 500,942 491,959
Deferred financing costs, accumulated amortization 2,898 2,616
Deferred financing costs (net of accumulated amortization) (2,807) (3,088)
Distribution payable 5,005 5,184
Payable for unsettled securities purchased 38,393 13,485
Other liabilities 5,307 6,090
Total liabilities 369,335 356,108
Members' capital 131,607 135,851
Total liabilities and net assets 500,942 491,959
SLP IV | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility $ 323,437 $ 334,437