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Organization - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jul. 17, 2024
Dec. 15, 2023
Dec. 15, 2022
Dec. 15, 2021
Dec. 15, 2020
Jul. 31, 2024
Oct. 31, 2021
Apr. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2019
Nov. 30, 2017
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
May 31, 2024
Apr. 30, 2023
Jan. 31, 2021
Debt Instrument [Line Items]                                    
Percentage of managed assets invested                         80.00%          
Net realized (gain) loss                         $ 26,674 $ (3,089)        
Common stock, par value                         $ 0.001   $ 0.001      
Debt securitization                               $ 300,700 $ 297,800 $ 300,700
Debt securitization retained amount           $ 85,000                        
Common stock shares issued                         7,276,000 0        
Common stock issued issued                         $ 82,708 $ 0        
Percentage of public offering price per notes issued             101.50%   99.40%                  
Current ATM Program                                    
Debt Instrument [Line Items]                                    
Common stock shares issued                         7,276,000 0        
Weighted average price per share of common stock issued                         $ 11.3 $ 0        
Proceeds from issuance of common stock gross                         $ 82,200          
Proceeds from issuance of common stock                         82,200 $ 0        
Legal and other offering costs           500,000             100 0        
At The Market Offerings Terminated           250,000                        
Common stock issued issued                         $ 355,000 $ 437,300        
Equity Distribution Agreements | Current ATM Program                                    
Debt Instrument [Line Items]                                    
Aggregate offering price $ 500,000                                  
Two Thousand Thirty One Asset Backed Debt [Member]                                    
Debt Instrument [Line Items]                                    
Debt securitization           $ 351,000                        
2026 Notes Payable                                    
Debt Instrument [Line Items]                                    
Notes payable to members             $ 85,000   $ 100,000                  
Percentage of public offering price per notes issued             101.50%   99.40%                  
Debt instrument, interest rate                         4.25%          
Debt instrument, maturity date                         Apr. 01, 2026          
Debt instrument, periodic payment                         semi-annually          
PennantPark-TSO Senior Loan Fund, LP                                    
Debt Instrument [Line Items]                                    
Sale of investments to wholly owned subsidiary               $ 81,400                    
Sale of investments to wholly owned subsidiary in cash               69,500                    
Sale of investments to wholly owned subsidiary in equity interest               $ 11,900                    
Percentage of outstanding class A units               23.08%         23.08%          
Net realized (gain) loss               $ 400                    
Capital commitment                         $ 15,300          
Voting interest in general partnership                         4.99%          
First Lien Secured Debt | Minimum                                    
Debt Instrument [Line Items]                                    
Percentage of overall portfolio                         65.00%          
Second Lien Secured Debt | Maximum                                    
Debt Instrument [Line Items]                                    
Percentage of overall portfolio                         35.00%          
2023 Notes                                    
Debt Instrument [Line Items]                                    
Notes payable to members                       $ 138,600            
Debt instrument, interest rate                   4.30%                
Debt instrument, periodic payment                         four annual installments          
Percentage of original principal amount payable   55.00% 15.00% 15.00% 15.00%                          
Notes issued                       $ 138,600            
Interest payment terms                         Interest on the 2023 Notes was payable semi-annually in arrears on June 15 and December 15 of each year, commencing June 15, 2018.          
2031 Asset-Backed Debt                                    
Debt Instrument [Line Items]                                    
Percentage of preferred shares of securitization issuer                     100.00%              
2031 Asset-Backed Debt | Class D Secured Deferrable Floating Rate Notes                                    
Debt Instrument [Line Items]                                    
Percentage of notes issued by securitization issuer                     100.00%