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Borrowings (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Borrowings    
Minimum asset coverage ratio 150.00%  
Asset coverage ratio 221.00% 199.00%
Outstanding borrowings $ 699,683 $ 751,486
Unrealized gain (loss) on foreign currency and other transactions (1)  
Realized gain (loss) on foreign currency and other transactions (4)  
Principal Amount Outstanding 711,386 $ 763,400
Revolving credit facility    
Borrowings    
Maximum borrowing capacity $ 450,000