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Subsequent Events (Details)
$ in Millions
Oct. 01, 2018
USD ($)
property
loan
Sep. 30, 2018
property
Sep. 30, 2018
Property
Dec. 31, 2017
Property
Subsequent Event [Line Items]        
Number of pledged properties   2 124 120
Subsequent Event        
Subsequent Event [Line Items]        
Loans repaid | loan 6      
Repayments of debt $ 66.3      
Prepayment penalty $ 0.1      
Weighted average interest rate (percentage) 6.07%      
Number of pledged properties | property 6