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Significant Agreements And Related Party Transactions - Schedule of Affiliated Investments Including Investments in Money Market Funds (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Non-Controlled Affiliates          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     $ 125,768 $ 131,993 $ 131,993
Gross Additions [1]     476,209   1,289,056
Gross Reductions [2]     (503,154)   (1,274,574)
Net Realized Gain(Loss) $ 0 $ (10,922) 0 (33,824) (33,824)
Net Change in Unrealized Appreciation (Depreciation) (6,865) $ 6,148 (13,893) 26,049 13,117
Ending Fair Value Balance 84,930   84,930   125,768
Dividend, Interest, PIK and Other Income     7,986   8,320
Investment, Identifier [Axis]: Non-Controlled Affiliates Animal Supply Holdings, LLC          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     0 0 0
Gross Additions [1]         0
Gross Reductions [2]         0
Net Realized Gain(Loss)         (22,902)
Net Change in Unrealized Appreciation (Depreciation)         22,902
Ending Fair Value Balance         0
Dividend, Interest, PIK and Other Income         0
Investment, Identifier [Axis]: Non-Controlled Affiliates Conergy Asia & ME Pte. LTD          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     0 0 0
Gross Additions [1]         0
Gross Reductions [2]         0
Net Realized Gain(Loss)         (6,355)
Net Change in Unrealized Appreciation (Depreciation)         6,355
Ending Fair Value Balance         0
Dividend, Interest, PIK and Other Income         0
Investment, Identifier [Axis]: Non-Controlled Affiliates Elah Holdings Inc.          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     5,396 5,396 5,396
Gross Additions [1]     0   0
Gross Reductions [2]     0   0
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     0   0
Ending Fair Value Balance 5,396   5,396   5,396
Dividend, Interest, PIK and Other Income     0   0
Investment, Identifier [Axis]: Non-Controlled Affiliates Goldman Sachs Financial Square Government Fund          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     35,724 25,238 25,238
Gross Additions [1]     471,372   1,280,435
Gross Reductions [2]     (470,870)   (1,269,949)
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     0   0
Ending Fair Value Balance 36,226   36,226   35,724
Dividend, Interest, PIK and Other Income     329   785
Investment, Identifier [Axis]: Non-Controlled Affiliates Iracore International Holdings, Inc.          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     2,728 7,015 7,015
Gross Additions [1]     0   0
Gross Reductions [2]     0   (1,502)
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     (495)   (2,785)
Ending Fair Value Balance 2,233   2,233   2,728
Dividend, Interest, PIK and Other Income     0   177
Investment, Identifier [Axis]: Non-Controlled Affiliates Kawa Solar Holdings Limited          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     0 741 741
Gross Additions [1]         0
Gross Reductions [2]         (614)
Net Realized Gain(Loss)         (4,567)
Net Change in Unrealized Appreciation (Depreciation)         4,440
Ending Fair Value Balance         0
Dividend, Interest, PIK and Other Income         0
Investment, Identifier [Axis]: Non-Controlled Affiliates MedeAnalytics Group Holdings, LLC          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     158 156 156
Gross Additions [1]     0   0
Gross Reductions [2]     (142)   0
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     (16)   2
Ending Fair Value Balance 0   0   158
Dividend, Interest, PIK and Other Income     0   0
Investment, Identifier [Axis]: Non-Controlled Affiliates Pluralsight, Inc.          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     27,494 42,214 42,214
Gross Additions [1]     141   1,812
Gross Reductions [2]     (73)   (73)
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     (13,786)   (16,459)
Ending Fair Value Balance 13,776   13,776   27,494
Dividend, Interest, PIK and Other Income     639   2,932
Investment, Identifier [Axis]: Non-Controlled Affiliates RPC ABC Investment Holdco LLC dba ABC Plumbing          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     11,574 11,551 11,551
Gross Additions [1]     0   1,595
Gross Reductions [2]     (12,633)   (543)
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     1,059   (1,029)
Ending Fair Value Balance 0   0   11,574
Dividend, Interest, PIK and Other Income     0   1,135
Investment, Identifier [Axis]: Non-Controlled Affiliates SDB HOLDCO, LLC dba Specialty Dental Brands          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     602 814 814
Gross Additions [1]     5   51
Gross Reductions [2]     0   (1)
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     (172)   (262)
Ending Fair Value Balance 435   435   602
Dividend, Interest, PIK and Other Income     11   63
Investment, Identifier [Axis]: Non-Controlled Affiliates SEM Holdings, LLC dba Southeast Mechanical, LLC          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     23,184 21,130 21,130
Gross Additions [1]     84   4,262
Gross Reductions [2]     (91)   (1,892)
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     (299)   (316)
Ending Fair Value Balance 22,878   22,878   23,184
Dividend, Interest, PIK and Other Income     1,195   2,458
Investment, Identifier [Axis]: Non-Controlled Affiliates Thrasio Holdings, Inc.          
Schedule Of Investments [Line Items]          
Beginning Fair Value Balance     18,908 $ 17,738 17,738
Gross Additions [1]     4,607   901
Gross Reductions [2]     (19,345)   0
Net Realized Gain(Loss)     0   0
Net Change in Unrealized Appreciation (Depreciation)     (184)   269
Ending Fair Value Balance $ 3,986   3,986   18,908
Dividend, Interest, PIK and Other Income     $ 5,812   $ 770
[1] Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK, the accretion of discounts, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.
[2] Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.