Mortgage Notes Receivable - Aggregate Principal Payments (Details) - Mortgage notes receivable [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Feb. 22, 2017
Subsequent Event [Line Items]
Due within one year	$ 1,104
Due after one year through five years	5,363
Due after five years through 10 years	7,018
Due after 10 years	15,154
Total	$ 28,639
Subsequent Event [Member]
Subsequent Event [Line Items]
Interest scheduled to be capitalized		$ 3,900