Quarterly report pursuant to Section 13 or 15(d)

Consolidated Schedule of Investments (Company's Controlled/Non Controlled Investments)

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Consolidated Schedule of Investments (Company's Controlled/Non Controlled Investments) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance $ 9,289,410    
Change in Unrealized Gains (Loss) 25,987 $ 77,873  
Net Realized Gain (Loss) (9,949) (10,731)  
Ending balance 9,917,572   $ 9,289,410
Affiliated | Southern Graphics Inc.      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,947 0 0
Gross Additions 0   9,747
Gross Reductions (57)   0
Change in Unrealized Gains (Loss) 0   200
Net Realized Gain (Loss) 0   0
Ending balance 9,890   9,947
Dividend and Interest Income 0   0
Affiliated | AD1 LBV1, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 0 0 0
Gross Additions     6,013
Gross Reductions     (5,149)
Change in Unrealized Gains (Loss)     0
Net Realized Gain (Loss)     (864)
Ending balance     0
Dividend and Interest Income     0
Affiliated | SLF V AD1 Holdings, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 9,877 0 0
Gross Additions 0   9,892
Gross Reductions 0   0
Change in Unrealized Gains (Loss) (46)   (15)
Net Realized Gain (Loss) 0   0
Ending balance 9,831   9,877
Dividend and Interest Income 0   0
Affiliated | ULTRA III, LLC      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 124,003 0 0
Gross Additions 35,000   129,675
Gross Reductions (2,400)   (4,162)
Change in Unrealized Gains (Loss) 6,688   (1,510)
Net Realized Gain (Loss) 0   0
Ending balance 163,291   124,003
Dividend and Interest Income 1,819   0
Noncontrolled/affiliated      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 19,824 0 0
Gross Additions 0   25,652
Gross Reductions (57)   (5,149)
Change in Unrealized Gains (Loss) (46) 0 185
Net Realized Gain (Loss) 0   (864)
Ending balance 19,721   19,824
Dividend and Interest Income 0   0
Controlled/affiliated      
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]      
Beginning balance 124,003 0 0
Gross Additions 35,000   129,675
Gross Reductions (2,400)   (4,162)
Change in Unrealized Gains (Loss) 6,688 $ 0 (1,510)
Net Realized Gain (Loss) 0   0
Ending balance 163,291   124,003
Dividend and Interest Income $ 1,819   $ 0