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UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT (Company Investments) (Details) - entity | Dec. 31, 2017 | Nov. 30, 2017 | Sep. 30, 2017
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Schedule of Equity Method Investments [Line Items] |  |  |
Number of entities - equity method of accounting (entity) | 17 |  |
Governor’s Square Company |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 47.50% |  |
Parent Company | Ambassador Infrastructure, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 65.00% |  |
Parent Company | Ambassador Town Center JV, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 65.00% |  |
Parent Company | CBL/T-C, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | CBL-TRS Joint Venture, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | EastGate Storage, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% | 50.00% |
Parent Company | El Paso Outlet Outparcels, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | Fremaux Town Center JV, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 65.00% |  |
Parent Company | G&I VIII CBL Triangle LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 10.00% |  |
Parent Company | Governor’s Square IB |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | Kentucky Oaks Mall Company |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | Mall of South Carolina L.P. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | Mall of South Carolina Outparcel L.P. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | Port Orange I, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | Shoppes at Eagle Point, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  | 50.00%
Parent Company | West Melbourne I, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |
Parent Company | York Town Center, LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Joint venture, ownership percentage | 50.00% |  |

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