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Debt - Secured Revolving Credit Facility (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Borrowing Capacity $ 105,000,000 $ 105,000,000
Goldman Sachs Bank USA | Revolving Credit Facility    
Debt Instrument [Line Items]    
Borrowing Capacity 125,000,000 100,000,000
Outstanding Borrowings $ 48,851,000 $ 23,949,000
Weighted Average Interest Rate on Outstanding Borrowings 3.30% 4.40%