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Mortgage and Other Indebtedness, Net (Schedule of Senior Unsecured Notes) (Details) - USD ($) |  | 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] |  |  |  |  |
Interest Rate |  | 4.72% | 4.72% |  | 4.82%
Additional debt issued |  |  | $ 1,097,006,000 | $ 614,671,000 |
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 |  |
Interest Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  | 5.37% | 5.37% |  | 5.48%
Senior Notes Due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount |  | $ 625,000,000 | $ 625,000,000 |  |
Additional debt issued | $ 225,000,000 | $ 225,000,000 |  |  |
Net proceeds from sale of debt | $ 218,913,000 |  |  |  |
Senior Notes Due 2026 | Treasury Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, basis spread on variable rate |  | 0.50% | 0.50% |  |
Senior Notes Due 2026 | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured debt to total assets |  | 40.00% | 40.00% |  |
Senior Notes Due 2026 | Interest Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  | 5.95% | 5.95% |  | 5.95%
Senior Notes Due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount |  | $ 300,000,000 | $ 300,000,000 |  |
Senior Notes Due 2024 | Treasury Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, basis spread on variable rate |  | 0.35% | 0.35% |  |
Senior Notes Due 2024 | Interest Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  | 4.60% | 4.60% |  | 4.60%
Senior Notes Due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount |  | $ 450,000,000 | $ 450,000,000 |  |
Senior Notes Due 2023 | Treasury Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, basis spread on variable rate |  | 0.40% | 0.40% |  |
Senior Notes Due 2023 | Interest Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  | 5.25% | 5.25% |  | 5.25%
Senior Notes Due 2023 and 2024 | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured debt to total assets |  | 40.00% | 40.00% |  |
Senior Notes Due 2023 and 2024 | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured debt to total assets |  | 45.00% | 45.00% |  |
Senior Notes Due 2023 and 2024 | Interest Rate | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, increase in variable interest rate |  | 0.25% | 0.25% |  |
Senior Notes Due 2023 and 2024 | Interest Rate | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, increase in variable interest rate |  | 1.00% | 1.00% |  |
Senior Unsecured Notes | Actual |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured debt to total assets |  | 24.00% | 24.00% |  |
Senior Unsecured Notes | Interest Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  | 5.25% | 5.25% |  |

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