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Real Estate Property Held For Sale - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 25, 2017
Dec. 31, 2017
Dec. 31, 2016
Real Estate [Line Items]      
Proceeds from the sale of real estate properties   $ 21,790 $ 127,859
Melbourne, FL      
Real Estate [Line Items]      
Gain on sale of property $ 12,519    
Proceeds from sale allocated to non-controlling partner 2,504    
Property held for sale | Melbourne, FL      
Real Estate [Line Items]      
Proceeds from the sale of real estate properties $ 8,969