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Subsequent Event (Details) - USD ($)
$ in Thousands
Feb. 28, 2023
Dec. 31, 2022
Dec. 31, 2021
Subsequent Event [Line Items]      
Amount outstanding   $ 951,322 $ 822,372
Series A Unsecured Notes Due 2026 | Subsequent Event      
Subsequent Event [Line Items]      
Debt instrument, aggregate principal amount $ 80,700    
Proceeds from issuance of long-term debt 77,900    
Minimum shareholders' equity, amount of net asset value $ 525,000    
Minimum asset coverage ratio 150.00%    
Unencumbered asset coverage ratio 1.25    
Amount outstanding $ 50,000    
Series A Unsecured Notes Due 2026 | SOFR | Subsequent Event      
Subsequent Event [Line Items]      
Variable rate 3.82%