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Debt - Secured Revolving Credit Facility (Details) - Goldman Sachs Bank USA - Revolving Credit Facility - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Borrowing Capacity $ 200,000,000 $ 100,000,000
Outstanding Borrowings $ 199,627,000 $ 23,949,000
Weighted-Average Interest Rate on Outstanding Borrowings 3.30% 4.40%