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Fair Value and Maturity of Debt Outstanding - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Debt Instrument [Line Items]    
Asset coverage ratio 283.30% 273.30%
Long-term debt $ 2,640,020 $ 2,737,276
Principal Outstanding $ 2,670,175 $ 2,769,156
Asset coverage ratio on our senior security stock 204.90% 215.60%
Senior Notes    
Debt Instrument [Line Items]    
Principal Outstanding $ 2,670,175 $ 2,769,156