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Mortgage and Other Indebtedness, Net - Mortgage and Other Indebtedness (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) extension_option | Jun. 04, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Fixed-rate debt, Amount | $ 3,160,776,000 |  | $ 3,158,973,000
Variable-rate debt, Amount | 970,508,000 |  | 1,090,810,000
Total fixed-rate and variable-rate debt | $ 4,131,284,000 |  | $ 4,249,783,000
Weighted-average interest rate (as a percent) | 5.04% |  | 4.74%
Unamortized deferred financing costs | $ (15,476,000) |  | $ (18,938,000)
Total mortgage and other indebtedness, net | $ 4,115,808,000 |  | $ 4,230,845,000
Fixed Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 5.37% |  | 5.37%
Variable Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 3.95% |  | 2.90%
Unsecured Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | $ 695,000,000 |  |
Variable-rate debt, Amount | $ 695,000,000 |  | $ 885,000,000
Unsecured Term Loan | Variable Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 3.96% |  | 2.81%
Non-recourse loans on operating properties |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument |  | $ 43,716,000 |
Fixed-rate debt, Amount | $ 1,797,080,000 |  | $ 1,796,203,000
Variable-rate debt, Amount | $ 0 |  | $ 10,836,000
Non-recourse loans on operating properties | Fixed Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 5.33% |  | 5.33%
Non-recourse loans on operating properties | Variable Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 0.00% |  | 3.37%
Senior Notes Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | $ 450,000,000 |  |
Fixed-rate debt, Amount | 447,309,000 |  | $ 446,976,000
Unamortized debt discount | $ 2,691,000 |  | $ 3,024,000
Senior Notes Due 2023 | Fixed Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 5.25% |  | 5.25%
Senior Notes Due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | $ 300,000,000 |  |
Fixed-rate debt, Amount | 299,951,000 |  | $ 299,946,000
Unamortized debt discount | $ 49,000 |  | $ 54,000
Senior Notes Due 2024 | Fixed Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 4.60% |  | 4.60%
Senior Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | $ 625,000,000 |  |
Fixed-rate debt, Amount | 616,436,000 |  | $ 615,848,000
Unamortized debt discount | $ 8,564,000 |  | $ 9,152,000
Senior Notes Due 2026 | Fixed Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 5.95% |  | 5.95%
Recourse loans on operating properties |  |  |
Debt Instrument [Line Items] |  |  |
Variable-rate debt, Amount | $ 74,150,000 |  | $ 101,187,000
Recourse loans on operating properties | Variable Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 4.73% |  | 4.00%
Unsecured lines of credit |  |  |
Debt Instrument [Line Items] |  |  |
Variable-rate debt, Amount | $ 201,358,000 |  | $ 93,787,000
Unsecured lines of credit | Variable Rate Interest |  |  |
Debt Instrument [Line Items] |  |  |
Weighted-average interest rate (as a percent) | 3.65% |  | 2.56%
Unsecured Term Loan 2 |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | $ 350,000,000 |  |
Variable rate (as a percent) | 1.75% |  |
Interest rate (as a percent) | 3.85% |  |
Unsecured Term Loan 1 |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | $ 300,000,000 |  |
Variable rate (as a percent) | 2.00% |  |
Interest rate (as a percent) | 4.10% |  |
Number of extension options available | extension_option | 2 |  |
Option extension term of debt instrument | 1 year |  |
Unsecured Term Loan 3 |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | $ 45,000,000 |  |
Variable rate (as a percent) | 1.65% |  |
Interest rate (as a percent) | 3.75% |  |

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