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Unconsolidated Affiliates and Noncontrolling Interests - Variable Interest Entities (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Ambassador Infrastructure, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 0 |
Maximum Risk of Loss | $ 10,050,000 |
Debt guaranteed (as a percent) | 100.00% |
Bullseye, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 5,000 |
Maximum Risk of Loss | 5,000 |
EastGate Storage, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | 939,000 |
Maximum Risk of Loss | $ 3,000,000 |
Debt guaranteed (as a percent) | 50.00% |
G&I VIII CBL Triangle LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 0 |
Maximum Risk of Loss | 0 |
Equity interest in real estate property (as a percent) |  | 90.00%
Parkdale Self Storage, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | 1,125,000 |
Maximum Risk of Loss | $ 6,500,000 |
Debt guaranteed (as a percent) | 100.00% |
Equity interest in real estate property (as a percent) | 50.00% |
Self-Storage at Mid Rivers, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 912,000 |
Maximum Risk of Loss | 2,717,000 |
Shoppes at Eagle Point, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | 16,344,000 |
Maximum Risk of Loss | 16,344,000 |
Maximum Guaranteed Amount | $ 12,740,000 |

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