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Mortgage and Other Indebtedness (Scheduled Principal Payments) (Details) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) loan | Dec. 31, 2015 | Dec. 31, 2016 USD ($)
Schedule of principal repayments [Abstract] |  |  |
2017 | $ 566,930 |  |
2018 | 720,639 |  |
2019 | 300,255 |  |
2020 | 372,753 |  |
2021 | 453,168 |  |
Thereafter | 1,842,125 |  |
Mortgage and other indebtedness | 4,255,870 |  |
Unamortized premiums and discounts, net | (7,713) |  |
Unamortized deferred financing costs | (16,406) |  | $ (17,855)
Total mortgage and other indebtedness, net | $ 4,249,440 |  | $ 4,465,294
Weighted average maturity of mortgage and other indebtedness (in years) | 4 years 2 months 5 days | 4 years 4 months 24 days |
Acadiana Mall |  |  |
Schedule of principal repayments [Abstract] |  |  |
Secured debt | $ 124,156 |  |
Mortgages | Wausau Center |  |  |
Schedule of principal repayments [Abstract] |  |  |
Total mortgage and other indebtedness, net | 17,689 |  |
Principal amortization |  |  |
Schedule of principal repayments [Abstract] |  |  |
2017 | 31,014 |  |
Operating property loan |  |  |
Schedule of principal repayments [Abstract] |  |  |
2017 | $ 185,916 |  |
Number of operating property loans | loan | 2 |  |
Unsecured Term Loan |  |  |
Schedule of principal repayments [Abstract] |  |  |
2017 | $ 350,000 |  |

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