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Mortgage and Other Indebtedness, Net (Narrative) (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) extension_option | Sep. 30, 2017 USD ($) loan credit_line | Dec. 31, 2016 | Jul. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 4.72% | 4.82% |  |  |
Principal maturities in 2017 |  | $ 134,159,000 |  |  |  |
Weighted-average maturity period |  | 4 years 8 months | 4 years 4 months 24 days |  |  |
Acadiana Mall |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt |  | $ 123,301,000 |  |  |  |
Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of unsecured term loans (loan, credit loan) | credit_line |  | 3 |  |  |  |
Loan agreement, basis spread on variable rate |  | 1.20% |  |  |  |
Annual facility fee |  | 0.25% |  |  |  |
Unsecured lines of credit | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate |  | 0.875% |  |  |  |
Annual facility fee |  | 0.125% |  |  |  |
Unsecured lines of credit | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate |  | 1.55% |  |  |  |
Annual facility fee |  | 0.30% |  |  |  |
Unsecured Term Loan 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate |  | 1.35% |  |  |  |
Debt instrument, face amount |  | $ 350,000,000 |  |  |  |
Debt instrument, option extension term |  | 1 year |  |  |  |
Interest rate |  | 2.59% |  |  |  |
Unsecured term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate | 1.50% |  |  |  |  |
Debt instrument, face amount | $ 490,000,000 | $ 490,000,000 |  |  | $ 400,000,000 |
Debt instrument, option extension term | 1 year |  |  |  |  |
Interest rate |  | 2.74% |  |  |  |
Number of extension options available (extension option) | extension_option | 2 |  |  |  |  |
Unsecured term loans | Forecast |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 300,000,000 |  |
Unsecured Term Loan 3 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 2.89% |  |  |  |
Loan agreement, basis spread on variable rate | 1.65% |  |  |  |  |
Debt instrument, face amount | $ 45,000,000 |  |  |  | $ 50,000,000 |
Operating property loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal maturities in 2017 |  | $ 123,301,000 |  |  |  |
Number of operating property loans (loan) | loan |  | 1 |  |  |  |
Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 5.37% | 5.48% |  |  |
Variable Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 2.77% | 2.15% |  |  |
Senior Unsecured Notes | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 5.25% |  |  |  |
Senior Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 300,000,000 |  |  |  |
Senior Notes Due 2024 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 4.60% | 4.60% |  |  |
Senior Notes Due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 625,000,000 |  |  |  |
Senior Notes Due 2026 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 5.95% | 5.95% |  |  |
Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of unsecured term loans (loan, credit loan) | loan |  | 3 |  |  |  |
Unsecured lines of credit | Variable Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 2.43% | 1.82% |  |  |
Unsecured term loans | Variable Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 2.69% | 2.04% |  |  |
Non-recourse loans on operating properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, default minimum | 50,000,000 |  |  |  |  |
Non-recourse loans on operating properties | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 5.34% | 5.55% |  |  |
Non-recourse loans on operating properties | Variable Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 3.04% | 3.13% |  |  |
Recourse term loans on operating properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, default minimum | $ 150,000,000 |  |  |  |  |
Recourse term loans on operating properties | Variable Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted- Average Interest Rate |  | 3.87% | 3.29% |  |  |
Mortgages | Outlet Shoppes at Atlanta - Ridgewalk |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal balance |  |  |  |  |  | $ 2,466,000
Principal amortization |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal maturities in 2017 |  | $ 10,858,000 |  |  |  |

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