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Related Party Arrangements - Line of Credit - Related Party (Narrative) (Details) - Line of Credit - Colony NorthStar, Inc.
9 Months Ended
Sep. 30, 2021
USD ($)
Related Party Transaction [Line Items]  
Maximum borrowing capacity $ 35,000,000
LIBOR  
Related Party Transaction [Line Items]  
Basis spread on variable interest rate 3.50%