XML 49 R105.htm IDEA: XBRL DOCUMENT
v3.19.3

Share-Based Compensation - Summary (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 11, 2019 $ / shares shares | Feb. 12, 2018 $ / shares shares | Feb. 07, 2017 $ / shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) installment $ / shares shares | Sep. 30, 2018 USD ($) | Dec. 31, 2015 | Sep. 30, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized under plan (shares) | shares |  |  |  |  |  |  |  |  | 10,400,000
Share-based compensation cost capitalized as part of real estate assets | $ |  |  |  | $ 13 | $ 36 | $ 54 | $ 260 |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  |  |  |  |  |  |  | $ 3,534
Compensation cost to be recognized over a weighted-average period |  |  |  |  |  | 2 years 6 months |  |  |
Number of shares authorized to be granted annually (shares) | shares |  |  |  |  |  |  |  |  | 200,000
Vested at conclusion of performance period |  |  |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Vesting rate (as a percent) |  |  |  |  |  | 60.00% |  |  |
Remaining percentage after performance period |  |  |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Vesting rate (as a percent) |  |  |  |  |  | 40.00% |  |  |
Vested each year for the first two anniversaries after conclusion of performance period |  |  |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Vesting rate (as a percent) |  |  |  |  |  | 20.00% |  |  |
Restricted Stock Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 571 | 787 | $ 2,830 | 3,263 |  |
Shares |  |  |  |  |  |  |  |  |
Nonvested, beginning of period (shares) | shares |  |  |  |  |  | 875,497 |  |  |
Granted (shares) | shares |  |  |  |  |  | 855,681 |  |  |
Vested (shares) | shares |  |  |  |  |  | (746,134) |  |  |
Forfeited (shares) | shares |  |  |  |  |  | (12,024) |  |  |
Nonvested, end of period (shares) | shares |  |  |  | 973,020 |  | 973,020 |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, nonvested, beginning of period (USD per share) | $ / shares |  |  |  |  |  | $ 7.99 |  |  |
Weighted-average grant date fair value, granted (USD per share) | $ / shares |  |  |  |  |  | 2.23 |  |  |
Weighted-average grant date fair value, vested (USD per share) | $ / shares |  |  |  |  |  | 5.11 |  |  |
Weighted-average grant date fair value, forfeited (USD per share) | $ / shares |  |  |  |  |  | 5.98 |  |  |
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares |  |  |  | $ 5.16 |  | $ 5.16 |  |  |
Number of annual installment for awards to vest (installment) | installment |  |  |  |  |  | 4 |  |  |
Fair value per share on valuation date (USD per share) | $ / shares |  |  |  | $ 5.16 |  | $ 7.99 |  |  | $ 5.16
Restricted Stock Awards | Vested on date of grant |  |  |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Vesting rate (as a percent) |  |  |  |  |  | 20.00% |  |  |
Performance Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 409 | $ 178 | $ 1,278 | $ 1,130 |  |
Shares |  |  |  |  |  |  |  |  |
Nonvested, beginning of period (shares) | shares |  |  |  |  |  | 910,911 |  |  |
Granted (shares) | shares |  |  |  |  |  | 1,103,537 |  |  |
Vested (shares) | shares |  |  |  |  |  | 0 |  |  |
Nonvested, end of period (shares) | shares |  |  |  | 2,014,448 |  | 2,014,448 |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, nonvested, beginning of period (USD per share) | $ / shares |  |  |  |  |  | $ 4.67 |  |  |
Weighted-average grant date fair value, granted (USD per share) | $ / shares |  |  |  |  |  | 2.40 |  |  |
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares | $ 4.74 | $ 4.76 | $ 6.86 | $ 3.42 |  | $ 3.42 |  |  |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  |  |  |  |  |  |  | $ 2,930
Compensation cost to be recognized over a weighted-average period |  |  |  |  |  | 4 years |  |  |
Performance period |  |  |  |  |  | 3 years |  | 3 years |
Vesting rate based on achievement of TSR relative to the NAREIT retail index (as a percent) |  |  |  |  |  | 66.67% |  |  |
Vesting rate based on the achievement of absolute TSR metrics (as a percent) |  |  |  |  |  | 33.33% |  |  |
Stock classified as a liability due to the potential cash component (shares) | shares |  |  |  |  |  | 566,862 |  |  |
Fair value per share on valuation date (USD per share) | $ / shares | $ 4.74 | $ 4.76 | $ 6.86 | $ 3.42 |  | $ 4.67 |  |  | $ 3.42
Risk-free interest rate (as a percent) | 2.54% | 2.36% | 1.53% |  |  |  |  |  |
Expected share price volatility (as a percent) | 60.99% | 42.02% | 32.85% |  |  |  |  |  |
Performance Stock Units | Chief Executive Officer |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |
Granted (shares) | shares | 357,800 | 240,164,000 |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares | $ 2.45 | $ 3.13 |  |  |  |  |  |  |
Fair value per share on valuation date (USD per share) | $ / shares | $ 2.45 | $ 3.13 |  |  |  |  |  |  |
Performance Stock Units | Officer |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |
Granted (shares) | shares | 178,875 | 120,064,000 |  |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value, nonvested, end of period (USD per share) | $ / shares | $ 2.29 | $ 1.63 |  |  |  |  |  |  |
Fair value per share on valuation date (USD per share) | $ / shares | $ 2.29 | $ 1.63 |  |  |  |  |  |  |

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Absolute Total Stockholder Return Metrics, Percentage + References No definition available. + Details
Name: | cbl_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsAbsoluteTotalStockholderReturnMetricsPercentage
Namespace Prefix: | cbl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Total Stockholder Return to the National Association of Real Estate Investment Trusts Retail Index, Percentage + References No definition available. + Details
Name: | cbl_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsTotalStockholderReturntotheNationalAssociationofRealEstateInvestmentTrustsRetailIndexPercentage
Namespace Prefix: | cbl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Classified as Liabilities + References No definition available. + Details
Name: | cbl_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodClassifiedasLiabilities
Namespace Prefix: | cbl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized to be Granted Annually + References No definition available. + Details
Name: | cbl_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAuthorizedtobeGrantedAnnually
Namespace Prefix: | cbl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share-based Compensation, Vesting, Number of Annual Installments + References No definition available. + Details
Name: | cbl_SharebasedCompensationVestingNumberofAnnualInstallments
Namespace Prefix: | cbl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cost capitalized for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=cbl_SharebasedCompensationAwardTrancheFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_OfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |