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Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Chapel Hill Mall [Member] | Mar. 31, 2014 Chapel Hill Mall [Member] Fair Value, Inputs, Level 3 [Member] | Apr. 30, 2014 Lakeshore Mall [Member] | Jun. 30, 2014 Lakeshore Mall [Member] | Apr. 30, 2014 Lakeshore Mall [Member] Fair Value, Inputs, Level 3 [Member] | Sep. 30, 2014 Pemberton Plaza [Member] | Sep. 30, 2014 Interest Rate Swap [Member] derivative_instrument | Dec. 31, 2013 Interest Rate Swap [Member] derivative_instrument | Dec. 31, 2013 Interest Rate Cap [Member] derivative_instrument | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2014 Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Instruments |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 | 1 |  |
Long-term debt, fair value | $ 4,905,034 |  | $ 4,905,034 |  | $ 5,126,300 |  |  |  |  |  |  |  |  |  |  |
Mortgage and other indebtedness | 4,711,421 |  | 4,711,421 |  | 4,857,523 |  |  |  |  |  |  |  |  |  |  |
Holding period |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed capitalization rate range used to determine fair value |  |  | 9% to 12% |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Cap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% | 12.00%
Loss on impairment of real estate | 497 | 0 | 17,753 | 21,038 |  | 12,050 |  | 5,100 | 106 |  | 497 |  |  |  |  |
Fair value of long-lived assets | $ 0 |  | $ 0 |  |  |  | $ 53,348 |  |  | $ 13,780 |  |  |  |  |  |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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=6391110&loc=d3e2921-110230 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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