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Disposal Group, Including Discontinued Operations, Debt Assumed

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Disposal Group, Including Discontinued Operations, Debt Voided

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Equity Method Investment, Equity Contributed, Value

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Equity Method Investment, Land Contributed

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Impairment of Real Estate, Reserve for Capital Expenditures

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Number of subsidiaries owned by the company.

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Number of Office Buildings Sold

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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Gross amount of debt extinguished.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element.

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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.

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UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT (Joint Ventures) (Details) $ in Thousands	1 Months Ended				3 Months Ended					9 Months Ended	12 Months Ended
	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) office_building	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($) subsidiary	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jul. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Sales price, gross											$ 189,750	$ 194,710	$ 104,860
Sales price, net											112,076	189,531	103,537
Gain (loss) on sales of real estate assets											93,792	29,567	32,232
Mortgage and other indebtedness, variable-rate debt			$ 888,770								1,090,810	888,770
Gain (loss) on extinguishment of debt											30,927		256
Mortgage debt assumed by buyer of real estate assets											0	38,150	14,570
Gain (loss) on investments											(6,197)	7,534	16,560
Loss on impairment											71,401	116,822	105,945
Mortgages
Schedule of Equity Method Investments [Line Items]
Mortgage note payables assumed														$ 38,150
Non Recourse Loans On Operating Properties
Schedule of Equity Method Investments [Line Items]
Mortgage and other indebtedness, variable-rate debt			19,055								10,836	19,055
CBL & Associates Properties, Inc.
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sales of real estate assets											93,792	29,567	32,232
Gain (loss) on extinguishment of debt											30,927	0	256
Gain (loss) on investments											(6,197)	7,534	16,560
Loss on impairment											$ 71,401	116,822	$ 105,945
Renaissance Center
Schedule of Equity Method Investments [Line Items]
Sales price, gross								$ 129,200
Gain (loss) on sales of real estate assets								29,437
River Ridge Mall JV, LLC
Schedule of Equity Method Investments [Line Items]
Sales price, gross				$ 33,500
Sales price, net				$ 32,905
Loss on impairment			$ 84						$ 9,510			9,594
Reserve for future capital expenditures									$ 2,100			$ 2,100
Percentage owned in disposed asset				75.00%					75.00%			75.00%
River Ridge Mall JV, LLC \| Parent Company
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sales of real estate assets						$ (5,843)
Renaissance Center - Phase I \| Mortgages
Schedule of Equity Method Investments [Line Items]
Mortgage debt assumed by buyer of real estate assets								16,000
Defeasance of debt in disposition								31,484
Corporate Joint Venture \| River Ridge Mall JV, LLC
Schedule of Equity Method Investments [Line Items]
Cash contributed by third party									$ 33,500
Quoted market value				$ 7,000					7,000
Repayment of long term line of credit									$ 32,819
River Ridge Mall JV, LLC
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage			25.00%		25.00%					25.00%		25.00%
Proceeds from sale of join venture										$ 9,000
Loss on sale of investment		$ 354								$ 5,843
River Ridge Mall JV, LLC \| Parent Company
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage				25.00%					25.00%
River Ridge Mall JV, LLC \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage				75.00%					75.00%
Shoppes at Eagle Point, LLC \| Parent Company
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage					50.00%					50.00%	50.00%
Shoppes at Eagle Point, LLC \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage					50.00%					50.00%
Cash contributed by third party					$ 1,031
EastGate Storage, LLC \| Parent Company
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage	50.00%										50.00%
Capital contribution, land	$ 1,134
EastGate Storage, LLC \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage	50.00%
JG Gulf Coast Town Center LLC
Schedule of Equity Method Investments [Line Items]
Gain (loss) on investments								$ 29,267
JG Gulf Coast Town Center LLC \| Parent Company
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage								50.00%			50.00%
JG Gulf Coast Town Center LLC \| Non Recourse Loans On Operating Properties
Schedule of Equity Method Investments [Line Items]
Mortgage and other indebtedness, variable-rate debt								$ 190,800
JG Gulf Coast Town Center LLC \| CBL & Associates Properties, Inc. \| Non Recourse Loans On Operating Properties
Schedule of Equity Method Investments [Line Items]
Mortgage and other indebtedness, variable-rate debt								95,400
JG Gulf Coast Town Center LLC \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage											50.00%
Gain (loss) on extinguishment of debt								63,294
Gulf Coast Town Center - Phase III \| Parent Company
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage											50.00%
CBL-TRS Joint Venture, LLC \| Parent Company
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage											50.00%
CBL-TRS Joint Venture, LLC \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Number of office buildings sold (office building) \| office_building			4
Sales price, gross			$ 26,000
Sales price, net			25,406				$ 14,962
Gain (loss) on sales of real estate assets			51
CBL-TRS Joint Venture, LLC \| Corporate Joint Venture \| Other Ownership Interest
Schedule of Equity Method Investments [Line Items]
Sales price, net			12,703
Gain (loss) on sales of real estate assets			25
Triangle Town Member LLC
Schedule of Equity Method Investments [Line Items]
Gain (loss) on sales of real estate assets			$ 2,820
Triangle Town Member LLC \| Parent Company
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage			10.00%	50.00%					50.00%			10.00%
Gain (loss) on sales of real estate assets			$ 282
Triangle Town Member LLC \| Mortgages \| Parent Company
Schedule of Equity Method Investments [Line Items]
Mortgage note payables assumed				$ 17,109					$ 17,109
Triangle Town Member LLC \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage			90.00%	50.00%					50.00%			90.00%
Sales price, gross			$ 30,250						$ 174,000
Sales price, net			29,802
Gain (loss) on sales of real estate assets			2,538						80,979
Mortgage and other indebtedness, variable-rate debt			$ 29,342									$ 29,342
Equity contribution									3,060
Triangle Town Member LLC \| Corporate Joint Venture \| Mortgages
Schedule of Equity Method Investments [Line Items]
Mortgage note payables assumed				$ 171,092					171,092
Triangle Town Member LLC \| Corporate Joint Venture \| Mortgages \| Other Ownership Interest
Schedule of Equity Method Investments [Line Items]
Mortgage note payables assumed				$ 85,546					$ 85,546
High Pointe Commons, LP and High Pointe Commons II-HAP, LP
Schedule of Equity Method Investments [Line Items]
Number of subsidiaries owned by the company (subsidiary) \| subsidiary							2
High Pointe Commons \| Parent Company
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage							50.00%
High Pointe Commons \| Mortgages
Schedule of Equity Method Investments [Line Items]
Extinguishment of debt							$ 17,388
High Pointe Commons \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Joint venture, ownership percentage							50.00%
Sales price, gross							$ 33,800
Gain (loss) on sales of real estate assets							16,649
Gain (loss) on extinguishment of debt							(393)
High Pointe Commons \| Corporate Joint Venture \| Other Ownership Interest
Schedule of Equity Method Investments [Line Items]
Sales price, net							7,481
Gain (loss) on sales of real estate assets							8,324
Gain (loss) on extinguishment of debt							$ (197)
Renaissance Center \| Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Sales price, net								80,324
Gain (loss) on sales of real estate assets								59,977
Renaissance Center \| Corporate Joint Venture \| Other Ownership Interest
Schedule of Equity Method Investments [Line Items]
Sales price, net								40,162
Gain (loss) on sales of real estate assets								$ 29,989