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Mortgage and Other Indebtedness, Net (Schedule of Mortgage and Other Indebtedness) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Fixed-rate debt, Amount |  | $ 3,170,000 | $ 3,170,000 |  | $ 3,594,379
Variable-rate debt, Amount |  | 1,065,450 | 1,065,450 |  | 888,770
Total fixed-rate and variable-rate debt |  | $ 4,235,450 | $ 4,235,450 |  | $ 4,483,149
Weighted- Average Interest Rate |  | 4.72% | 4.72% |  | 4.82%
Unamortized deferred financing costs |  | $ (19,272) | $ (19,272) |  | $ (17,855)
Total mortgage and other indebtedness, net |  | $ 4,216,178 | 4,216,178 |  | $ 4,465,294
Additional debt issued |  |  | $ 1,097,006 | $ 614,671 |
Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 2.77% | 2.77% |  | 2.15%
Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 5.37% | 5.37% |  | 5.48%
Non-recourse loans on operating properties |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed-rate debt, Amount |  | $ 1,807,519 | $ 1,807,519 |  | $ 2,453,628
Variable-rate debt, Amount |  | $ 10,868 | $ 10,868 |  | $ 19,055
Non-recourse loans on operating properties | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 3.04% | 3.04% |  | 3.13%
Non-recourse loans on operating properties | Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 5.34% | 5.34% |  | 5.55%
Senior Notes Due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed-rate debt, Amount |  | $ 446,868 | $ 446,868 |  | $ 446,552
Unamortized debt discount |  | $ 3,132 | $ 3,132 |  | $ 3,448
Senior Notes Due 2023 | Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 5.25% | 5.25% |  | 5.25%
Senior Notes Due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed-rate debt, Amount |  | $ 299,944 | $ 299,944 |  | $ 299,939
Unamortized debt discount |  | $ 56 | $ 56 |  | $ 61
Senior Notes Due 2024 | Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 4.60% | 4.60% |  | 4.60%
Senior Notes Due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed-rate debt, Amount |  | $ 615,669 | $ 615,669 |  | $ 394,260
Unamortized debt discount |  | 9,331 | $ 9,331 |  | $ 5,740
Additional debt issued | $ 225,000 | $ 225,000 |  |  |
Senior Notes Due 2026 | Fixed Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 5.95% | 5.95% |  | 5.95%
Recourse term loans on operating properties |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable-rate debt, Amount |  | $ 89,612 | $ 89,612 |  | $ 24,428
Recourse term loans on operating properties | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 3.87% | 3.87% |  | 3.29%
Construction loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable-rate debt, Amount |  | $ 0 | $ 0 |  | $ 39,263
Construction loan | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 0.00% | 0.00% |  | 3.12%
Unsecured lines of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable-rate debt, Amount |  | $ 79,970 | $ 79,970 |  | $ 6,024
Unsecured lines of credit | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 2.43% | 2.43% |  | 1.82%
Unsecured term loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable-rate debt, Amount |  | $ 885,000 | $ 885,000 |  | $ 800,000
Unsecured term loans | Variable Rate Interest |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted- Average Interest Rate |  | 2.69% | 2.69% |  | 2.04%

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