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Investments in Partially Owned Entities - Additional Information (Details) - Unconsolidated Non-VIE
$ in Millions
Dec. 31, 2017
USD ($)
Legacy JV [Member]  
Liquidation Value Preferred Interests $ 37.3
PARTIALLY OWNED PROPERTIES  
Joint venture ownership percentage owned by company 60.00%
Residual JV [Member]  
PARTIALLY OWNED PROPERTIES  
Joint venture ownership percentage owned by company 60.00%