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Mortgage and Other Indebtedness (Scheduled Principal Payments) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) loan | Dec. 31, 2015 | Dec. 31, 2016 USD ($)
Schedule of principal repayments [Abstract] |  |  |
2017 | $ 571,982 |  |
2018 | 722,481 |  |
2019 | 318,457 |  |
2020 | 433,689 |  |
2021 | 455,026 |  |
Thereafter | 1,887,555 |  |
Mortgage and other indebtedness | 4,389,190 |  |
Unamortized premiums and discounts, net | (7,416) |  |
Unamortized deferred financing costs | (16,983) |  | $ (17,855)
Total mortgage and other indebtedness, net | $ 4,522,480 |  | $ 4,465,294
Weighted average maturity of mortgage and other indebtedness (in years) | 4 years 3 months | 4 years 4 months 24 days |
Acadania Mall |  |  |
Schedule of principal repayments [Abstract] |  |  |
Secured debt | $ 124,998 |  |
Mortgages | Chesterfield Mall and Wausau Center |  |  |
Schedule of principal repayments [Abstract] |  |  |
Total mortgage and other indebtedness, net | 157,689 |  |
Mortgages | Wausau Center |  |  |
Schedule of principal repayments [Abstract] |  |  |
Total mortgage and other indebtedness, net | 17,689 |  |
Mortgages | Chesterfield Mall |  |  |
Schedule of principal repayments [Abstract] |  |  |
Total mortgage and other indebtedness, net | 140,000 |  |
Principal amortization |  |  |
Schedule of principal repayments [Abstract] |  |  |
2017 | 34,936 |  |
Operating property loan |  |  |
Schedule of principal repayments [Abstract] |  |  |
2017 | $ 187,046 |  |
Number of operating property loans | loan | 2 |  |
Unsecured Term Loan |  |  |
Schedule of principal repayments [Abstract] |  |  |
2017 | $ 350,000 |  |

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