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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 |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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