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Organization and Basis of Presentation - Narrative (Details) $ in Thousands, shares in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) state subsidiary shares | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Number of states in which entity operates | state | 26 |  |  |
Net cash provided by (used in) investing activities | $ 14,325 | $ 35,412 |  |
Net cash provided by (used in) financing activities | (278,109) | (298,049) |  |
Principal payments on mortgage and other indebtedness | 649,904 | 1,159,144 |  |
Cash, cash equivalents, restricted cash, and restricted cash equivalents | $ 56,145 | 68,558 | $ 68,172 | $ 65,069
CBL & Associates Limited Partnership |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Number of subsidiaries owned by the company | subsidiary | 2 |  |  |
Ownership of the sole general partner in partnership (as a percent) | 1.00% |  |  |
Limited partnership interest owned by CBL Holdings II, Inc. in the operating partnership (as a percent) | 85.60% |  |  |
Combined ownership by the subsidiaries in operating partnership (as a percent) | 86.60% |  |  |
Consolidated Properties |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Non-controlling limited partner interest ownership of CBL's Predecessor in the Operating Partnership (as a percent) | 9.10% |  |  |
Non-controlling limited partner interest of third parties in Operating partnership (as a percent) | 4.30% |  |  |
Common stock owned by CBL's Predecessor (shares) | shares | 4.0 |  |  |
Total combined effective interest of CBL's Predecessor in Operating Partnership (as a percent) | 11.10% |  |  |
Accounting Standards Update 2016-18 |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Net cash provided by (used in) investing activities |  | 1,261 |  |
Net cash provided by (used in) financing activities |  | (1,261) |  |
Principal payments on mortgage and other indebtedness |  | 7,650 |  |
Cash, cash equivalents, restricted cash, and restricted cash equivalents |  | $ (8,911) |  |
CBL Holdings | Consolidated Properties |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |
Ownership interest in qualified subsidiaries (as a percent) | 100.00% |  |  |

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