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SLR Senior Lending Program LLC - Summary financial information for SSLP (Parenthetical) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Condensed Financial Statements, Captions [Line Items]    
Cost $ 2,138,238 $ 2,039,566 [1]
Debt instrument, face amount 1,147,436 1,041,093
Debt issuance costs 8,474 9,399
SLR Senior Lending Program LLC [Member]    
Condensed Financial Statements, Captions [Line Items]    
Cost 186,403 177,236
Debt instrument, face amount 112,500 96,600
Debt issuance costs $ 1,194 $ 1,572
[1] Aggregate net unrealized appreciation for U.S. federal income tax purposes is $7,625; aggregate gross unrealized appreciation and depreciation for U.S. federal tax purposes is $109,461 and $101,836, respectively, based on a tax cost of $1,998,009. Unless otherwise noted, all of the Company’s investments are pledged as collateral against the borrowings outstanding on the Credit Facility (as defined below) (see note 7 to the consolidated financial statements). 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. All investments are Level 3 unless otherwise indicated.