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Mortgage Notes Payable - Footnotes (Details) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 15, 2016 | Jan. 14, 2016 | Jan. 06, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Oct. 06, 2016
Mortgage loans payable on real estate |  |  |  |  |  |  |
Unamortized deferred finance costs |  |  |  | $ 12,716,000 | $ 16,025,000 |  |
Gain (loss) on extinguishment of debt |  |  |  | $ 13,737,000 | $ 16,066,000 | $ (526,000) |
Northgate Mall |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  | 3.50% |  |  |
Arrowhead Towne Center |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Interest in the loan assumed by a third party (as a percent) |  |  | 40.00% |  |  |  |
Percentage of ownership interest sold |  |  | 40.00% |  |  |  |
MAC Heitman Portfolio |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Percentage of ownership interest sold |  | 49.00% |  | 49.00% |  |  |
MAC Heitman Portfolio | Joint venture |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Percentage of ownership interest sold |  | 49.00% |  |  |  |  |
Arrowhead Towne Center |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Face amount of debt |  |  | $ 400,000,000 |  |  |  |
Effective interest rate (as a percent) |  |  | 4.05% |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (3,575,000) |  |  |  |
Interest in the loan assumed by a third party (as a percent) |  |  | 40.00% |  |  |  |
Chandler Fashion Center |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Interest in the loan assumed by a third party (as a percent) |  |  |  | 49.90% |  |  |
Fashion Outlets of Chicago |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  | 2.43% | 1.84% |  |
Variable interest rate spread (as a percent) |  |  |  | 1.50% |  |  |
Flagstaff Mall |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ 5,284,000 |  |  |  |  |  |
Fresno Fashion Fair |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | $ 325,000,000
Effective interest rate (as a percent) |  |  |  | 3.67% |  |  |
Northgate Mall |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  | 3.30% |  |
Variable interest rate spread (as a percent) |  |  |  | 2.25% |  |  |

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