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Mortgage Notes Payable - Premiums and Discounts (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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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