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Mortgage Notes Payable - Footnotes (Details) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 04, 2017 USD ($) extension_periods | Dec. 31, 2017 USD ($) | Oct. 19, 2017 USD ($) | Sep. 29, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Disclosure [Abstract] |  |  |  |  |
Unamortized deferred finance costs |  | $ 17,838,000 |  |  | $ 12,716,000
Fashion Outlets of Chicago |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |
Effective interest rate (as a percent) |  | 3.02% |  |  |
Freehold Raceway Mall |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  | 3.94%
Green Acres Commons |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |
Effective interest rate (as a percent) |  | 4.07% |  |  |
Santa Monica Place |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |
Effective interest rate (as a percent) |  | 3.13% |  |  |
Freehold Raceway Mall and 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 |  |  |  |  |
Variable interest rate spread (as a percent) |  | 1.50% |  |  |
Effective interest rate (as a percent) |  |  |  |  | 2.43%
Freehold Raceway Mall | Joint venture |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |
Mortgage loan |  |  | $ 400,000,000 |  |
Green Acres Commons |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |
Variable interest rate spread (as a percent) |  | 2.15% |  |  |
Mortgage loan |  |  |  | $ 110,000,000 |
Loan expansion, up to |  |  |  | $ 130,000,000 |
Santa Monica Place |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |
Variable interest rate spread (as a percent) | 1.35% |  |  |  |
1 year extensions options | extension_periods | 3 |  |  |  |
Mortgage loan | $ 300,000,000 |  |  |  |
Santa Monica Place | Maximum |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |
Variable interest rate spread (as a percent) | 4.00% |  |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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