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Mortgage Notes Payable - Footnotes (Details) - USD ($) |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 15, 2016 | Jan. 14, 2016 | Jan. 06, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Mortgage loans payable on real estate |  |  |  |  |  |
Unamortized deferred finance costs |  |  |  | $ 11,567,000 |  | $ 16,025,000
Gain (loss) on early extinguishment of debt, net |  |  |  | $ 13,737,000 | $ 609,000 |
Freehold Raceway Mall |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Percentage of loan assumed by third party (percent) |  |  |  | 49.90% |  |
Fashion Outlets of Chicago |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Effective interest rate (percent) |  |  |  | 2.18% |  |
Northgate Mall |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Effective interest rate (percent) |  |  |  | 3.40% |  |
Arrowhead Towne Center |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Percentage of loan assumed by third party (percent) |  |  | 40.00% |  |  |
Ownership interest sold (percent) |  |  | 40.00% | 40.00% |  |
MAC Heitman Portfolio |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Ownership interest sold (percent) |  | 49.00% |  | 49.00% |  |
Arrowhead Towne Center |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Face amount of debt |  |  | $ 400,000,000 |  |  |
Effective interest rate (percent) |  |  | 4.05% |  |  |
Gain (loss) on early extinguishment of debt, net |  |  | $ (3,575,000) |  |  |
Percentage of loan assumed by third party (percent) |  |  | 40.00% |  |  |
Fashion Outlets of Chicago |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  | 1.84%
Interest rate spread over basis (percent) |  |  |  | 1.50% |  |
Flagstaff Mall |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Gain (loss) on early extinguishment of debt, net | $ 5,284,000 |  |  |  |  |
Northgate Mall |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  | 3.30%
Interest rate spread over basis (percent) |  |  |  | 2.25% |  |

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