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REDEEMABLE INTERESTS AND NONCONTROLLING INTERESTS - Operating Partnership (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 unitholder shares | Dec. 31, 2018 USD ($) shares | Nov. 30, 2005 quarter $ / shares shares | Dec. 31, 2020 USD ($) unitholder shares | Dec. 31, 2019 USD ($) unitholder shares | Dec. 31, 2018 USD ($) unitholder shares | Dec. 31, 2012 USD ($) shares | Jun. 30, 2005 quarter $ / shares shares | Jul. 31, 2004 USD ($) $ / shares shares
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Value of redemption of units | $ |  |  |  |  | $ 96 | $ 2,246 |  |  |
Redeemable noncontrolling interest, units exercised for conversion (shares) |  |  |  |  | 72,592 | 526,510 |  |  |
Number of holders of common units who received cash for their units (unitholder) | unitholder |  |  |  |  | 1 | 2 |  |  |
Operating Partnership |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, ownership interest of noncontrolling owners (as a percent) |  |  |  | 0.80% | 0.80% |  |  |  |
Noncontrolling interest, ownership interest of noncontrolling owners (as a percent) |  |  |  | 1.80% | 12.20% |  |  |  |
K-SCUs |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Value of redemption of units | $ |  | $ 21 |  |  |  |  |  |  |
Redeemable noncontrolling interest, units exercised for conversion (shares) |  | 8,120 |  |  |  |  |  |  |
Operating Partnership |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Units of partnership interest (shares) |  |  |  | 5,117,856 | 26,073,966 |  |  |  |
Redeemable noncontrolling interest, units exercised for conversion (shares) |  |  |  | 20,956,110 | 611,847 | 915,338 |  |  |
Redeemable noncontrolling interest, shares issued upon exercise of common units (shares) |  |  |  | 20,956,110 | 611,847 | 915,338 |  |  |
Number of holders of common units who received cash for their units (unitholder) | unitholder |  |  |  | 31 | 2 | 1 |  |  |
Redeemable noncontrolling interest, allocation from (to) shareholder's equity, adjustment | $ | $ |  |  |  | $ 302 | $ 3,398 | $ 4,065 |  |  |
Noncontrolling interest, allocation from (to) Shareholder's Equity, Adjustment | $ | $ |  |  |  | $ 6,002 | $ 4,392 | $ 13,642 |  |  |
Operating Partnership | CBL's Predecessor |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Units of partnership interest (shares) |  |  |  |  | 18,117,350 |  |  |  |
Operating Partnership | Third Parties |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Units of partnership interest (shares) |  |  |  | 5,117,856 | 7,956,616 |  |  |  |
Operating Partnership | The Company |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interests | $ | $ |  |  |  | $ (265) | $ 2,160 |  |  |  |
Noncontrolling interests | $ |  |  |  | $ (604) | $ 31,592 |  |  |  |
Operating Partnership | S-SCUs |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Units of partnership interest (shares) |  |  |  |  |  |  |  |  | 1,560,940
Limited partnership agreement, noncontrolling interest redemption right, acquisition price threshold of qualifying property | $ |  |  |  |  |  |  |  |  | $ 20,000
Operating Partnership | S-SCUs | After Five Years |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Limited partnership agreement, annual distribution term, amount per unit (USD per unit) | $ / shares |  |  |  |  |  |  |  |  | $ 2.92875
Operating Partnership | L-SCUs |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Units of partnership interest (shares) |  |  |  |  |  |  |  | 571,700 |
Limited partnership agreement, condition to participate in Distribution at common unit rate , number of consecutive quarters of distribution exceeding minimum (quarter) | quarter |  |  |  |  |  |  |  | 4 |
Operating Partnership | L-SCUs | Earlier of June 1, 2020 Or When Distribution Exceeds Minimum |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Limited partnership agreement, annual distribution term, amount per unit (USD per unit) | $ / shares |  |  |  |  |  |  |  | $ 3.0288 |
Limited partnership agreement, quarterly distribution term, amount per unit (USD per unit) | $ / shares |  |  |  |  |  |  |  | $ 0.7572 |
Operating Partnership | Common Units |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Units of partnership interest (shares) |  |  |  |  |  |  | 622,278 |  |
Partnership units, value | $ |  |  |  |  |  |  | $ 14,000 |  |
Ownership interest acquired (as a percent) |  |  |  |  |  |  | 30.00% |  |
Operating Partnership | K-SCUs |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Units of partnership interest (shares) |  |  | 1,144,924 |  |  |  |  |  |
Limited partnership agreement, condition to participate in Distribution at common unit rate , number of consecutive quarters of distribution exceeding minimum (quarter) | quarter |  |  | 4 |  |  |  |  |  |
Redeemable noncontrolling interest, units exercised for conversion (shares) | 267,983 |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, shares issued upon exercise of common units (shares) | 267,983 |  |  |  |  |  |  |  |
Number of holders of common units who received cash for their units (unitholder) | unitholder | 1 |  |  |  |  |  |  |  |
Operating Partnership | K-SCUs | After First Year |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Partnership unit, dividend rate (as a percent) |  |  | 6.25% |  |  |  |  |  |
Partnership unit, dividends (USD per share) | $ / shares |  |  | $ 2.96875 |  |  |  |  |  |
Limited partnership agreement, redemption right, conversion rate to common stock, per share |  |  | 1 |  |  |  |  |  |

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