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Mortgage and Other Indebtedness, Net (Summary of Dispositions for Which Debt Was Transferred) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2017 | Jan. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  | $ 6,452 | $ (6) | $ 30,927 | $ 0
Midland Mall | Mortgages |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate at Repayment Date |  |  | 6.10% |  |  |  |
Balance of Non-recourse Debt |  |  | $ 31,953 |  |  |  |
Gain on extinguishment of debt |  |  | $ 3,760 |  |  |  |
Chesterfield Mall | Mortgages |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate at Repayment Date |  | 5.74% |  |  |  |  |
Balance of Non-recourse Debt |  | $ 140,000 |  |  |  |  |
Gain on extinguishment of debt |  | $ 29,187 |  |  |  |  |
Wausau Center | Mortgages |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate at Repayment Date | 5.85% |  |  |  |  |  |
Balance of Non-recourse Debt | $ 17,689 |  |  |  |  |  |
Gain on extinguishment of debt | $ 6,851 |  |  |  |  |  |
Midland Mall and Chesterfield Mall |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Balance of Non-recourse Debt |  |  |  | $ 189,642 |  | 189,642 |
Gain on extinguishment of debt |  |  |  |  |  | $ 39,798 |

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- Definition Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(c)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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