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SLR Senior Lending Program LLC - Summary financial information for SSLP (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Condensed Financial Statements, Captions [Line Items]          
Investments at fair value (cost $186,403 and $177,236, respectively) $ 2,105,293   $ 2,105,293   $ 2,005,634 [1]
Total assets 2,529,892   2,529,892   2,449,417
Debt outstanding ($112,500 and $96,600 face amounts, respectively, reported net of unamortized debt issuance costs of $1,194 and $1,572, respectively) 1,138,962   1,138,962   1,031,694
Total liabilities 1,536,605   1,536,605   1,456,491
Interest and other credit facility expenses 18,684 $ 18,913 51,266 $ 55,280  
Other general and administrative expenses 1,859 1,189 3,616 3,290  
Total expenses 35,379 35,464 98,778 104,461  
Net investment income 21,626 24,348 65,340 72,518  
Realized gain on investments 1,323 (2,748) 1,136 (2,508)  
Net change in unrealized gain (loss) on investments 356 449 987 3,138  
Net realized and unrealized gain (loss) on investments and cash equivalents 1,679 (2,299) 2,123 630  
Net increase in net assets resulting from operations 23,305 22,049 67,463 73,148  
SLR Senior Lending Program LLC [Member]          
Condensed Financial Statements, Captions [Line Items]          
Investments at fair value (cost $186,403 and $177,236, respectively) 187,210 [2]   187,210 [2]   178,740 [3]
Cash and other assets 24,311   24,311   18,721
Total assets 211,521   211,521   197,461
Debt outstanding ($112,500 and $96,600 face amounts, respectively, reported net of unamortized debt issuance costs of $1,194 and $1,572, respectively) 111,306   111,306   95,028
Distributions payable 2,684   2,684   3,381
Interest payable and other credit facility related expenses 429   429   472
Accrued expenses and other payables 383   383   398
Total liabilities 114,802   114,802   99,279
Members' equity 96,719   96,719   98,182
Total liabilities and members' equity 211,521   211,521   $ 197,461
Interest income 5,092 6,375 14,119 18,960  
Service fees [4] 116 132 330 392  
Interest and other credit facility expenses 2,263 2,800 6,753 8,438  
Other general and administrative expenses 57 46 189 136  
Total expenses 2,436 2,978 7,272 8,966  
Net investment income 2,656 3,397 6,847 9,994  
Realized gain on investments 21 0 358 0  
Net change in unrealized gain (loss) on investments (353) 29 (697) 420  
Net realized and unrealized gain (loss) on investments and cash equivalents (332) 29 (339) 420  
Net increase in net assets resulting from operations $ 2,324 $ 3,426 $ 6,508 $ 10,414  
[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.
[2] Represents the fair value in accordance with ASC Topic 820. The determination of such fair value is not included in the Board’s valuation process described elsewhere herein.
[3] Represents the fair value in accordance with ASC Topic 820. The determination of such fair value is not included in the Board’s valuation process described elsewhere herein.
[4]

* Service fees are included within the Company’s Consolidated Statements of Operations as other income.