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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract] |  |  |
Defined contribution plan, age of eligibility | 21 years |  |
Defined contribution plan, required service period prior to plan participation | 60 days |  |
Defined contribution plan, employer matching contribution (as a percent) | 50.00% |  |
Defined contribution plan, maximum annual contribution per employee (as a percent) | 2.50% |  |
Defined contribution plan, employer discretionary contribution amount | $ 921,000 | $ 1,003,000 | $ 1,034,000

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- Definition Defined Contribution Plan Age of Eligibility + References No definition available. + Details
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- Definition Defined Contribution Plan, Required Service Period Prior to Plan Participation + References No definition available. + Details
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Namespace Prefix: | cbl_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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