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Mortgage and Other Indebtedness, Net - Mortgage and Other Indebtedness (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Fixed-rate debt, Amount | $ 3,099,680 | $ 3,158,973
Variable-rate debt, Amount | 1,089,189 | 1,090,810
Total fixed-rate and variable-rate debt | $ 4,188,869 | $ 4,249,783
Weighted-average interest rate (as a percent) | 4.88% | 4.74%
Unamortized deferred financing costs | $ (16,516) | $ (18,938)
Total mortgage and other indebtedness, net | $ 4,172,353 | $ 4,230,845
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) | 3.50% | 2.90%
Non-recourse loans on operating properties |  |
Debt Instrument [Line Items] |  |
Fixed-rate debt, Amount | $ 1,736,299 | $ 1,796,203
Variable-rate debt, Amount | $ 10,774 | $ 10,836
Non-recourse loans on operating properties | Fixed Rate Interest |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 5.32% | 5.33%
Non-recourse loans on operating properties | Variable Rate Interest |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 4.24% | 3.37%
Senior Notes Due 2023 |  |
Debt Instrument [Line Items] |  |
Fixed-rate debt, Amount | $ 447,196 | $ 446,976
Unamortized debt discount | $ 2,804 | $ 3,024
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] |  |
Fixed-rate debt, Amount | $ 299,949 | $ 299,946
Unamortized debt discount | $ 51 | $ 54
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] |  |
Fixed-rate debt, Amount | $ 616,236 | $ 615,848
Unamortized debt discount | $ 8,764 | $ 9,152
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 | $ 80,790 | $ 101,187
Recourse loans on operating properties | Variable Rate Interest |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 4.61% | 4.00%
Unsecured lines of credit |  |
Debt Instrument [Line Items] |  |
Variable-rate debt, Amount | $ 112,625 | $ 93,787
Unsecured lines of credit | Variable Rate Interest |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 3.18% | 2.56%
Unsecured term loans |  |
Debt Instrument [Line Items] |  |
Variable-rate debt, Amount | $ 885,000 | $ 885,000
Unsecured term loans | Variable Rate Interest |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 3.43% | 2.81%

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