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Related Party Arrangements - Colony NorthStar Line of Credit (Narrative) (Details) - Line of Credit - Colony NorthStar, Inc. - USD ($)
1 Months Ended
Oct. 31, 2017
Oct. 01, 2017
Related Party Transaction [Line Items]    
Maximum borrowing capacity $ 15,000,000.0 $ 35,000,000.0
LIBOR    
Related Party Transaction [Line Items]    
Interest rate 3.50%