v3.26.3
Unaudited Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Investment Company, Net Assets [Roll Forward]          
Beginning balance (in shares)     104,706,884    
Beginning balance $ 1,145,886 $ 1,175,844 $ 1,160,682 $ 1,190,354 $ 1,190,354
Net investment income 27,234 33,613 82,089 89,813  
Net realized gain (loss) on investments / CSAs / foreign currency transactions / forward currency contracts (4,782) (1,307) 3,231 (17,533)  
Net unrealized (depreciation) appreciation on investments / CSAs / foreign currency transactions / forward currency contracts 2,178 (8,756) (22,368) 4,406  
Distributions of net investment income $ (27,224) $ (32,599) (81,671) (97,906)  
Deemed contribution - CSA (See Note 2)     $ 1,329    
Purchases of shares in repurchase plan       $ (2,339)  
Ending balance (in shares) 104,706,884 105,158,938 104,706,884 105,158,938 104,706,884
Ending balance $ 1,143,292 $ 1,166,795 $ 1,143,292 $ 1,166,795 $ 1,160,682
Common Stock          
Investment Company, Net Assets [Roll Forward]          
Beginning balance (in shares) 104,706,884 105,158,938 104,706,884 105,408,938 105,408,938
Beginning balance $ 104 $ 105 $ 104 $ 105 $ 105
Purchases of shares in repurchase plan (in shares)       (250,000)  
Ending balance (in shares) 104,706,884 105,158,938 104,706,884 105,158,938 104,706,884
Ending balance $ 104 $ 105 $ 104 $ 105 $ 104
Additional Paid-In Capital          
Investment Company, Net Assets [Roll Forward]          
Beginning balance 1,864,163 1,844,638 1,862,834 1,846,977 1,846,977
Deemed contribution - CSA (See Note 2)     1,329    
Purchases of shares in repurchase plan       (2,339)  
Ending balance 1,864,163 1,844,638 1,864,163 1,844,638 1,862,834
Total Distributable Earnings (Loss)          
Investment Company, Net Assets [Roll Forward]          
Beginning balance (718,381) (668,899) (702,256) (656,728) (656,728)
Net investment income 27,234 33,613 82,089 89,813  
Net realized gain (loss) on investments / CSAs / foreign currency transactions / forward currency contracts (4,782) (1,307) 3,231 (17,533)  
Net unrealized (depreciation) appreciation on investments / CSAs / foreign currency transactions / forward currency contracts 2,178 (8,756) (22,368) 4,406  
Distributions of net investment income (27,224) (32,599) (81,671) (97,906)  
Ending balance $ (720,975) $ (677,948) $ (720,975) $ (677,948) $ (702,256)