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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 10, 2012 | Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2012 Government and government sponsored entities [Member] | Dec. 31, 2011 Government and government sponsored entities [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Equity Securities [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Equity Securities [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Equity Securities [Member] Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] | Dec. 31, 2012 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] | Dec. 31, 2012 Interest Rate Swap [Member] Fair Value, Measurements, Recurring [Member] | Dec. 31, 2012 Courtyard at Hickory Hollow [Member] | Dec. 31, 2011 Courtyard at Hickory Hollow [Member] | Dec. 31, 2012 Columbia Place [Member] | Dec. 31, 2010 Columbia Place [Member] | Sep. 30, 2011 Columbia Place [Member] Fair Value, Measurements, Nonrecurring [Member] | Sep. 30, 2011 Outparcel Sale [Member] Fair Value, Measurements, Nonrecurring [Member] | Dec. 31, 2012 Outparcel Sale [Member] Fair Value, Measurements, Nonrecurring [Member] | Dec. 31, 2010 Outparcel Sale [Member] Fair Value, Measurements, Nonrecurring [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable Securities, Realized Gain (Loss) |  | $ 224 |  | $ 22 |  | $ 114 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Cap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 12.00%
Assumed Capitalization Rate Range Used To Determine Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | .1 | .12
Long-lived assets fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,604 | 6,141 |  |  | 3,274 | 5,754 | 6,141 | 58,207 |  |  |  |  |  |
Loss on impairment of real estate |  | 24,379 | [1] | 51,304 | [1] | 1,156 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,315 |  |  |  |  |  |  |  |  | (621) | (1,064) | 1,156 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  | 27,679 |  | 30,613 |  |  |  |  |  | 11,123 | 13,561 | 27,679 | 30,613 | 16,556 | 18,784 |  |  | 11,123 | 11,829 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Privately held debt and equity securities |  |  |  |  |  |  |  |  | 2,475 |  |  |  |  |  |  |  |  |  |  | 2,475 | 2,475 | 2,475 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liabilities |  |  |  |  |  |  |  |  |  |  |  | 5,805 | 5,617 |  |  | 5,805 | 5,617 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of instruments held |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 4 |  |  |  |  |  |  |  |  |  |
Net realized gains and losses on sale of available-for-sale securities |  | 224 |  | (22) |  | (114) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of mortgage and other indebtedness |  | 5,058,411 |  | 4,836,028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) |  |  |  |  |  |  |  |  |  | 1,542 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer out of Level 3 |  | (2,248) | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses | 12,983 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,477 | 1,186 |  |  |
Real Estate Investment Property, Net |  | 6,328,982 |  | 6,005,670 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,063 | 2,098 | 2,250 |  |  |
Real Estate, Capital Expenditures |  |  |  | 142 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 644 |  |  |  |  |  |  |  |  |
Depreciation, Depletion and Amortization |  | $ 265,192 |  | $ 270,828 |  | $ 279,936 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (124) |  |  |  |  |  |  |  |  |
[1] | The referenced amounts for the years ended December 31, 2011 and 2010 have been restated. See Note 2 for more information. Loss on impairment of real estate for the year ended December 31, 2012 consisted of $20,315 related to Malls, $3,000 related to Associated Centers and $1,064 related to All Other. Loss on impairment of real estate for the year ended December 31, 2011 consisted of $50,683 related to Malls and $621 related to All Other. Loss on impairment of real estate for the year ended December 31, 2010 consisted of $1,156 related to All Other.
[2] | (1)The TIF bonds were adjusted to their net realizable value as of December 31, 2012 with the difference in estimate recorded as a transfer to long-lived assets. See for additional information related to the redemption of the bonds in January 2013.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Percentage of voting equity interests acquired in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=6943989&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 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)) -URI http://asc.fasb.org/extlink&oid=6880815&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=6872113&loc=d3e27405-111563 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + 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 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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