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Mortgage Notes Payable - Footnotes (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Jun. 27, 2019 | Jun. 03, 2019 | Jan. 10, 2019
Mortgage loans payable on real estate |  |  |  |  |  |
Unamortized deferred finance costs | $ 12,202 | $ 13,053 |  |  |  |
Chandler Fashion Center |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
New loan |  |  |  | $ 256,000 |  |
Effective interest rate | 4.18% |  |  | 4.18% |  |
Fashion Outlets of Chicago |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
New loan |  |  |  |  |  | $ 300,000
Effective interest rate | 4.61% |  |  |  |  |
Green Acres Commons |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Effective interest rate | 4.81% | 5.06% |  |  |  |
SanTan Village Regional Center |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Effective interest rate | 4.34% |  |  |  |  |
Kings Plaza Shopping Center | Subsequent event | Forecast |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
New loan |  |  | $ 555,000 |  |  |
Effective interest rate |  |  | 3.67% |  |  |
Loan term |  |  | 10 years |  |  |
Chandler Freehold |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Percentage of loan assumed by third party | 49.90% |  |  |  |  |
Fashion Outlets of Niagara Falls USA |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Debt premiums | $ 1,004 | $ 1,701 |  |  |  |
Fashion Outlets of Chicago |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Interest rate spread over basis |  | 2.15% |  |  |  |
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 |  |  |  |  |  |
Effective interest rate | 3.63% | 4.01% |  |  |  |
Interest rate spread over basis | 1.35% |  |  |  |  |
Santa Monica Place | Maximum | Cap |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
Interest rate spread over basis | 4.00% |  |  |  |  |
SanTan Village Regional Center |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |
New loan |  |  |  |  | $ 220,000 |

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