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Leases - Right-of-Use Asset and Lease Liability Activity (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 USD ($)
ROU Asset |
Balance at beginning of period | $ 4,160
Cash reduction | (365)
Noncash increase | 172
Balance at end of period | 3,967
Lease Liability |
Balance at beginning of period | 4,074
Cash reduction | (365)
Noncash increase | 266
Balance at end of period | $ 3,975

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- Definition Increase (Decrease) in Operating Lease, Liability, Cash + References No definition available. + Details
Name: | cbl_IncreaseDecreaseinOperatingLeaseLiabilityCash
Namespace Prefix: | cbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (Decrease) in Operating Lease, Liability, Noncash + References No definition available. + Details
Name: | cbl_IncreaseDecreaseinOperatingLeaseLiabilityNoncash
Namespace Prefix: | cbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (Decrease) in Operating Lease, Right-of-Use Asset, Noncash + References No definition available. + Details
Name: | cbl_IncreaseDecreaseinOperatingLeaseRightofUseAsset
Namespace Prefix: | cbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase (Decrease) in Operating Lease, Right-of-Use Asset, Cash + References No definition available. + Details
Name: | cbl_IncreaseDecreaseinOperatingLeaseRightofUseAssetCash
Namespace Prefix: | cbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lease Liability Activity [Roll Forward] + References No definition available. + Details
Name: | cbl_LeaseLiabilityActivityRollForward
Namespace Prefix: | cbl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Right-of-Use Asset Activity [Roll Forward] + References No definition available. + Details
Name: | cbl_RightofUseAssetActivityRollForward
Namespace Prefix: | cbl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant