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Mortgage Notes Payable - Premiums and Discounts (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Mortgage loans payable on real estate
Debt premiums (discounts), net	$ 5,907	$ 18,408
Arrowhead Towne Center
Mortgage loans payable on real estate
Debt premiums	0	8,494
Deptford Mall One
Mortgage loans payable on real estate
Debt discounts	0	(3)
Fashion Outlets of Niagara Falls USA
Mortgage loans payable on real estate
Debt premiums	3,558	4,486
Stonewood Center
Mortgage loans payable on real estate
Debt premiums	2,349	5,168
Superstition Springs Center
Mortgage loans payable on real estate
Debt premiums	$ 0	$ 263

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-SubTopic 30
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