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Mortgage and Other Indebtedness, Net - Senior Unsecured Notes (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 5.04% | 4.74%
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] |  |
Weighted-average interest rate (as a percent) | 5.37% | 5.37%
Senior Notes Due 2023 |  |
Debt Instrument [Line Items] |  |
Amount | $ 450,000,000 |
Senior Notes Due 2023 | Treasury Rate |  |
Debt Instrument [Line Items] |  |
Derivative, basis spread on variable rate | 0.40% |
Senior Notes Due 2023 | Interest Rate |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 5.25% | 5.25%
Senior Notes Due 2024 |  |
Debt Instrument [Line Items] |  |
Amount | $ 300,000,000 |
Senior Notes Due 2024 | Treasury Rate |  |
Debt Instrument [Line Items] |  |
Derivative, basis spread on variable rate | 0.35% |
Senior Notes Due 2024 | Interest Rate |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 4.60% | 4.60%
Senior Notes Due 2026 |  |
Debt Instrument [Line Items] |  |
Amount | $ 625,000,000 |
Senior Notes Due 2026 | Treasury Rate |  |
Debt Instrument [Line Items] |  |
Derivative, basis spread on variable rate | 0.50% |
Senior Notes Due 2026 | Minimum |  |
Debt Instrument [Line Items] |  |
Secured debt to total assets (as a percent) | 40.00% |
Senior Notes Due 2026 | Interest Rate |  |
Debt Instrument [Line Items] |  |
Weighted-average interest rate (as a percent) | 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% |
Senior Notes Due 2023 and 2024 | Maximum |  |
Debt Instrument [Line Items] |  |
Secured debt to total assets (as a percent) | 45.00% |
Senior Notes Due 2023 and 2024 | Interest Rate | Minimum |  |
Debt Instrument [Line Items] |  |
Debt instrument, increase in variable interest rate | 0.25% |
Senior Notes Due 2023 and 2024 | Interest Rate | Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, increase in variable interest rate | 1.00% |
Senior Unsecured Notes | Actual |  |
Debt Instrument [Line Items] |  |
Secured debt to total assets (as a percent) | 24.00% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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