Mortgage Notes Receivable - Narrative (Details)	3 Months Ended
	Mar. 31, 2017 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage notes receivable	9
Mortgage notes receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage notes receivable	9
Weighted-average interest rate	6.30%
Weighted-average years to maturity	12 years 9 months 18 days
Number of mortgage notes with capitalized principal and interest	1