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Debt - Unsecured Notes Payable (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument    
Principal Balance $ 482,089,565 $ 424,174,758
Carrying Value 480,462,652 422,280,515
Fair Value 478,397,706 $ 419,407,194
Unsecured note payable    
Debt Instrument    
Principal Balance 85,125,000  
Carrying Value 81,706,136  
Fair Value $ 85,193,100