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Unconsolidated Affiliates, Redeemable Interests, Noncontrolling Interests and Cost Method Investments (Unconsolidated Affiliates)(Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2016 | Feb. 29, 2016 | Mar. 31, 2016 | Mar. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loss on impairment |  |  | $ 19,685 | $ 0
River Ridge Mall |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Reserve for capital expenditures | $ 2,100 |  |  |
G&I VIII CBL Triangle LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in real estate property | 10.00% |  | 10.00% |
River Ridge Mall |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in real estate property | 25.00% |  | 25.00% |
River Ridge Mall |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loss on impairment | $ 9,510 |  |  |
Ownership percentage sold | 75.00% |  |  |
Parent Company | G&I VIII CBL Triangle LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in real estate property |  | 10.00% |  |
Parent Company | Triangle Town Center, Triangle Town Commons and Triangle Town Place |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in real estate property |  | 50.00% |  |
Parent Company | River Ridge Mall |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in real estate property | 25.00% |  | 25.00% |
Corporate Joint Venture | G&I VIII CBL Triangle LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in real estate property |  | 90.00% |  |
Sales price |  | $ 174,000 |  |
Value of equity contributed |  | $ 3,060 |  |
Corporate Joint Venture | Triangle Town Center, Triangle Town Commons and Triangle Town Place |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in real estate property |  | 50.00% |  |
Corporate Joint Venture | River Ridge Mall |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of equity interest in real estate property | 75.00% |  | 75.00% |
Corporate Joint Venture | River Ridge Mall |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cash contributed by third party | $ 33,500 |  |  |
Value of equity method investment | 7,000 |  | $ 7,000 |
Cash used to reduce balances on lines of credit | $ 32,819 |  |  |
Corporate Joint Venture | Mortgages | G&I VIII CBL Triangle LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Mortgage note payables assumed |  | $ 171,092 |  |
Corporate Joint Venture | Other Ownership Interest | G&I VIII CBL Triangle LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Mortgage note payables assumed |  | $ 85,546 |  |

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