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Debt - Summary of Commitments, Borrowings Outstanding and Fair Value of Notes (Details) - Unsecured Notes - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Commitments $ 205,400 $ 195,400
Total Amount Outstanding 205,400 195,400
Fair Value 206,715 195,682
GECCO Notes    
Debt Instrument [Line Items]    
Commitments 57,500 57,500
Total Amount Outstanding 57,500 57,500
Fair Value 57,500 57,017
GECCZ Notes    
Debt Instrument [Line Items]    
Commitments   40,000
Total Amount Outstanding   40,000
Fair Value   40,360
GECCI Notes    
Debt Instrument [Line Items]    
Commitments 56,500 56,500
Total Amount Outstanding 56,500 56,500
Fair Value 57,201 56,988
GECCH Notes    
Debt Instrument [Line Items]    
Commitments 41,400 41,400
Total Amount Outstanding 41,400 41,400
Fair Value 41,814 $ 41,317
GECCG Notes    
Debt Instrument [Line Items]    
Commitments 50,000  
Total Amount Outstanding 50,000  
Fair Value $ 50,200