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Mortgage Notes Receivable - Aggregate Principal Payments (Details) - Mortgage notes receivable [Member]
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Subsequent Event [Line Items]  
Due within one year $ 900
Due after one year through five years 4,261
Due after five years through 10 years 7,052
Due after 10 years 14,506
Total 26,719
Interest scheduled to be capitalized $ 3,800