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Mortgage Notes Receivable - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Mortgage notes receivable, held-for-sale | $ $ 17.3
Fair value of mortgage notes receivable | $ $ 16.4
Mortgage notes receivable [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Number of mortgage notes receivable | loan 8
Weighted-average interest rate 6.20%
Weighted-average years to maturity 11 years 10 months 24 days
Number of mortgage notes with capitalized principal and interest | loan 1
Number of mortgage notes receivable, carrying value exceeding fair value | loan 7
Valuation allowance | $ $ 0.9