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Mortgage Notes Payable - Premiums and Discounts (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Mortgage loans payable on real estate |  |
Debt premiums (discounts), net | $ 2,630 | $ 5,907
Fashion Outlets of Niagara Falls USA |  |
Mortgage loans payable on real estate |  |
Debt premiums | 2,630 | 3,558
Stonewood Center |  |
Mortgage loans payable on real estate |  |
Debt premiums | $ 0 | $ 2,349

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