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Mortgage Notes Payable - Footnotes (Details) - USD ($) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 04, 2017 | Jun. 30, 2018 | Mar. 01, 2018 | Dec. 31, 2017
Mortgage loans payable on real estate |  |  |  |
Unamortized deferred finance costs |  | $ 15,638,000 |  | $ 17,838,000
Fashion Outlets of Niagara Falls USA |  |  |  |
Mortgage loans payable on real estate |  |  |  |
Debt premiums |  | $ 2,166,000 |  | $ 2,630,000
Chandler Freehold |  |  |  |
Mortgage loans payable on real estate |  |  |  |
Percentage of loan assumed by third party |  | 49.90% |  |
Fashion Outlets of Chicago |  |  |  |
Mortgage loans payable on real estate |  |  |  |
Interest rate spread over basis |  | 1.50% |  |
Effective interest rate |  |  |  | 3.02%
Green Acres Commons |  |  |  |
Mortgage loans payable on real estate |  |  |  |
Interest rate spread over basis |  | 2.15% |  |
Santa Monica Place |  |  |  |
Mortgage loans payable on real estate |  |  |  |
Interest rate spread over basis | 1.35% |  |  |
Effective interest rate |  | 3.67% |  | 3.13%
Fashion Outlets of Chicago |  |  |  |
Mortgage loans payable on real estate |  |  |  |
Effective interest rate |  | 3.64% |  |
Green Acres Commons |  |  |  |
Mortgage loans payable on real estate |  |  |  |
Effective interest rate |  | 4.69% |  | 4.07%
Mortgage Loans on Real Estate, Face Amount of Mortgages, Additional Borrowing |  |  | $ 20,000,000 |

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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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