Mortgage Notes Receivable - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) loan	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage notes receivable	8
Mortgage notes receivable, net | $	$ 20,722		$ 22,764
Mortgage notes receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of mortgage notes receivable	8
Weighted-average interest rate	6.20%
Weighted-average years to maturity	13 years 1 month 16 days
Number of mortgage notes with capitalized principal and interest	1
Mortgage notes receivable, net | $	$ 20,722	$ 1,500