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NON-RECOURSE BORROWINGS - Narrative (Details) - Weighted average
Dec. 31, 2017
Dec. 31, 2016
Property-specific borrowings    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 4.90% 4.90%
Subsidiary borrowings    
Disclosure of detailed information about borrowings [line items]    
Annual Rate 4.10% 4.10%