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Unconsolidated Affiliates and Noncontrolling Interests (Variable Interest Entities) (Details) - USD ($) | Sep. 30, 2017 | Mar. 31, 2016
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Ambassador Infrastructure, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 0 |
Maximum Risk of Loss | $ 11,035,000 |
Percentage of debt guaranteed | 100.00% |
Percentage of equity interest in real estate property | 65.00% |
Shoppes at Eagle Point, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 14,754,000 |
Maximum Risk of Loss | $ 14,754,000 |
Percentage of equity interest in real estate property | 50.00% |
Shoppes at Eagle Point, LLC | Corporate Joint Venture |  |
Noncontrolling Interest [Line Items] |  |
Percentage of equity interest in real estate property |  | 50.00%
Shoppes at Eagle Point, LLC | Parent Company |  |
Noncontrolling Interest [Line Items] |  |
Percentage of equity interest in real estate property |  | 50.00%
G&I VIII CBL Triangle LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 1,464,000 |
Maximum Risk of Loss | $ 1,464,000 |

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