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Mortgage and Other Indebtedness (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) loan extension_option credit_line | Feb. 28, 2017 USD ($) | Jan. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) loan extension_option credit_line | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 4.65% |  |  | 4.65% |  | 4.82%
Long-term debt, percentage bearing fixed interest, amount | $ 3,389,900,000 |  |  | $ 3,389,900,000 |  | $ 3,594,379,000
Mortgage and other indebtedness amount carrying value | 1,149,563,000 |  |  | 1,149,563,000 |  | 888,770,000
Total fixed-rate and variable-rate debt | 4,539,463,000 |  |  | 4,539,463,000 |  | 4,483,149,000
Unamortized deferred financing costs | (16,983,000) |  |  | (16,983,000) |  | (17,855,000)
Total mortgage and other indebtedness, net | $ 4,522,480,000 |  |  | 4,522,480,000 |  | $ 4,465,294,000
Repayments of Long-term Debt |  |  |  | 159,726,000 |  |
Gain on extinguishment of debt |  |  |  | $ 4,055,000 | $ 6,000 |
Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notice required to redeem debt, term |  |  |  | 30 days |  |
Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notice required to redeem debt, term |  |  |  | 60 days |  |
Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 5.46% |  |  | 5.46% |  | 5.48%
Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 2.28% |  |  | 2.28% |  | 2.15%
Wells Fargo Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Letter of credit, outstanding | $ 150,000 |  |  | $ 150,000 |  |
Senior Unsecured Notes | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 5.25% |  |  | 5.25% |  |
Senior Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount | $ 299,941,000 |  |  | $ 299,941,000 |  | $ 299,939,000
Unamortized debt discount | 59,000 |  |  | 59,000 |  | $ 61,000
Debt instrument, face amount | $ 300,000,000 |  |  | $ 300,000,000 |  |
Senior Notes Due 2024 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 4.60% |  |  | 4.60% |  | 4.60%
Senior Notes Due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount | $ 394,367,000 |  |  | $ 394,367,000 |  | $ 394,260,000
Unamortized debt discount | 5,633,000 |  |  | 5,633,000 |  | $ 5,740,000
Debt instrument, face amount | $ 400,000,000 |  |  | $ 400,000,000 |  |
Senior Notes Due 2026 | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) | 40.00% |  |  | 40.00% |  |
Senior Notes Due 2026 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 5.95% |  |  | 5.95% |  | 5.95%
Senior Notes Due 2023 and 2024 | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) | 40.00% |  |  | 40.00% |  |
Senior Notes Due 2023 and 2024 | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) | 45.00% |  |  | 45.00% |  |
Senior Notes Due 2023 and 2024 | Fixed Rate Interest | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, increase in variable interest rate | 0.25% |  |  | 0.25% |  |
Senior Notes Due 2023 and 2024 | Fixed Rate Interest | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, increase in variable interest rate | 1.00% |  |  | 1.00% |  |
Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of unsecured term loans | loan | 3 |  |  | 3 |  |
Non-recourse loans on operating properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount | $ 2,248,936,000 |  |  | $ 2,248,936,000 |  | $ 2,453,628,000
Mortgage and other indebtedness amount carrying value | $ 16,488,000 |  |  | 16,488,000 |  | $ 19,055,000
Debt instrument, default minimum |  |  |  | $ 50,000,000 |  |
Non-recourse loans on operating properties | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 5.53% |  |  | 5.53% |  | 5.55%
Non-recourse loans on operating properties | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 2.90% |  |  | 2.90% |  | 3.13%
Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount | $ 446,656,000 |  |  | $ 446,656,000 |  | $ 446,552,000
Unamortized debt discount | 3,344,000 |  |  | 3,344,000 |  | $ 3,448,000
Debt instrument, face amount | $ 450,000,000 |  |  | $ 450,000,000 |  |
Senior Notes Due 2023 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 5.25% |  |  | 5.25% |  | 5.25%
Recourse term loans on operating properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value | $ 24,727,000 |  |  | $ 24,727,000 |  | $ 24,428,000
Debt instrument, default minimum |  |  |  | $ 150,000,000 |  |
Recourse term loans on operating properties | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 3.46% |  |  | 3.46% |  | 3.29%
Construction loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value | $ 56,243,000 |  |  | $ 56,243,000 |  | $ 39,263,000
Construction loan | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 3.28% |  |  | 3.28% |  | 3.12%
Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value | $ 252,105,000 |  |  | $ 252,105,000 |  | $ 6,024,000
Unsecured lines of credit | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 2.03% |  |  | 2.03% |  | 1.82%
Unsecured term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value | $ 800,000,000 |  |  | $ 800,000,000 |  | $ 800,000,000
Unsecured term loans | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 2.23% |  |  | 2.23% |  | 2.04%
Debt Covenant Requirement | Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) | 45.00% |  |  | 45.00% |  |
Total debt to total asset value (as a percent) | 60.00% |  |  | 60.00% |  |
Total Unencumbered Assets to Unsecured Debt (as a percent) | 150.00% |  |  | 150.00% |  |
Consolidated income available for debt service to annual debt service charge (as a percent) | 150.00% |  |  | 150.00% |  |
Debt Covenant Requirement | Unsecured Credit Facility and Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt to total asset value (as a percent) | 60.00% |  |  | 60.00% |  |
Total Unencumbered Assets to Unsecured Debt (as a percent) | 160.00% |  |  | 160.00% |  |
Unencumbered NOI to unsecured interest expense (as a percent) | 175.00% |  |  | 175.00% |  |
EBITDA to fixed charges (debt service) (as a percent) | 150.00% |  |  | 150.00% |  |
Debt Covenant Ratios Actual | Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) | 27.00% |  |  | 27.00% |  |
Total debt to total asset value (as a percent) | 53.00% |  |  | 53.00% |  |
Total Unencumbered Assets to Unsecured Debt (as a percent) | 211.00% |  |  | 211.00% |  |
Consolidated income available for debt service to annual debt service charge (as a percent) | 310.00% |  |  | 310.00% |  |
Debt Covenant Ratios Actual | Unsecured Credit Facility and Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt to total asset value (as a percent) | 49.00% |  |  | 49.00% |  |
Total Unencumbered Assets to Unsecured Debt (as a percent) | 230.00% |  |  | 230.00% |  |
Unencumbered NOI to unsecured interest expense (as a percent) | 370.00% |  |  | 370.00% |  |
EBITDA to fixed charges (debt service) (as a percent) | 250.00% |  |  | 250.00% |  |
Treasury Rate | Senior Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, basis spread on variable rate | 0.35% |  |  | 0.35% |  |
Treasury Rate | Senior Notes Due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, basis spread on variable rate | 0.50% |  |  | 0.50% |  |
Treasury Rate | Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, basis spread on variable rate | 0.40% |  |  | 0.40% |  |
Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of unsecured term loans | credit_line | 3 |  |  | 3 |  |
Mortgage and other indebtedness amount carrying value | $ 252,105,000 |  |  | $ 252,105,000 |  |
Loan agreement, basis spread on variable rate (as a percentage) |  |  |  | 1.20% |  |
Annual facility Fee (percent) |  |  |  | 0.25% |  |
Total Capacity | 1,100,000,000 |  |  | $ 1,100,000,000 |  |
Unsecured lines of credit | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate (as a percentage) |  |  |  | 0.875% |  |
Annual facility Fee (percent) |  |  |  | 0.125% |  |
Unsecured lines of credit | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate (as a percentage) |  |  |  | 1.55% |  |
Annual facility Fee (percent) |  |  |  | 0.30% |  |
Wells Fargo - Facility A |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value | 0 |  |  | $ 0 |  |
Total Capacity | 500,000,000 |  |  | 500,000,000 |  |
Unsecured Line of Credit, First Tennessee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value | 27,400,000 |  |  | 27,400,000 |  |
Total Capacity | 100,000,000 |  |  | 100,000,000 |  |
Wells Fargo - Facility B |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value | 224,705,000 |  |  | 224,705,000 |  |
Total Capacity | 500,000,000 |  |  | 500,000,000 |  |
Wells Fargo Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Capacity | 30,000,000 |  |  | 30,000,000 |  |
First Tennessee Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Capacity | 20,000,000 |  |  | 20,000,000 |  |
Unsecured Term Loan 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 350,000,000 |  |  | $ 350,000,000 |  |
Loan agreement, basis spread on variable rate (as a percentage) |  |  |  | 1.35% |  |
Number of extension options available | extension_option | 2 |  |  | 2 |  |
Debt instrument, option extension term (in years) |  |  |  | 1 year |  |
Interest Rate at Repayment Date | 2.13% |  |  | 2.13% |  |
Unsecured term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 400,000,000 |  |  | $ 400,000,000 |  |
Loan agreement, basis spread on variable rate (as a percentage) |  |  |  | 1.50% |  |
Interest Rate at Repayment Date | 2.28% |  |  | 2.28% |  |
Unsecured Term Loan 3 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) | 2.53% |  |  | 2.53% |  |
Debt instrument, face amount | $ 50,000,000 |  |  | $ 50,000,000 |  |
Loan agreement, basis spread on variable rate (as a percentage) |  |  |  | 1.55% |  |
Wells Fargo Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, extension fee (percent) |  |  |  | 0.15% |  |
Wells Fargo Bank | Unsecured Line of Credit, First Tennessee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, extension fee (percent) |  |  |  | 0.20% |  |
Chesterfield Mall and Wausau Center | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total mortgage and other indebtedness, net | 157,689,000 |  |  | $ 157,689,000 |  |
Debt instrument, default amount | 157,689,000 |  |  | 157,689,000 |  |
Outlet Shoppes at Atlanta - Ridgewalk | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, default amount | $ 2,466,000 |  |  | $ 2,466,000 |  |
Midland Mall | Mortgages |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, default amount |  |  | $ 31,953,000 |  |  |
Gain on extinguishment of debt |  |  | $ 4,055,000 |  |  |
The Plaza at Fayette Mall |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate at Repayment Date |  |  | 5.67% |  |  |
Repayments of Long-term Debt |  |  | $ 37,146,000 |  |  |
The Shoppes at St Clair |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate at Repayment Date |  |  | 5.67% |  |  |
Repayments of Long-term Debt |  |  | $ 18,827,000 |  |  |
Hamilton Corner |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate at Repayment Date |  | 5.67% |  |  |  |
Repayments of Long-term Debt |  | $ 14,227,000 |  |  |  |
Layton Hills Mall |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate at Repayment Date | 5.66% |  |  | 5.66% |  |
Repayments of Long-term Debt | $ 89,526,000 |  |  |  |  |

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