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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Columbia Place [Member] | Dec. 31, 2010 Columbia Place [Member] | Dec. 31, 2012 Imperial Valley Commons, L.P. [Member] | Sep. 30, 2012 Imperial Valley Commons, L.P. [Member] | Dec. 31, 2012 Courtyard at Hickory Hollow [Member] | Dec. 31, 2011 Courtyard at Hickory Hollow [Member] | Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] | Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Columbia Place [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Columbia Place [Member] | Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Imperial Valley Commons, L.P. [Member] | Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Courtyard at Hickory Hollow [Member] | Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Courtyard at Hickory Hollow [Member] | Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Outparcel Sale [Member] | Dec. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Outparcel Sale [Member] | Dec. 31, 2010 Fair Value, Measurements, Nonrecurring [Member] Outparcel Sale [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2011 Courtyard at Hickory Hollow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed Capitalization Rate Range Used To Determine Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | .1 |
Real Estate, Capital Expenditures |  |  |  | $ 142 |  |  |  |  |  |  |  | $ 644 |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation, Depletion and Amortization |  | 265,192 |  | 270,828 |  | 279,936 |  |  |  |  |  | (124) |  |  |  |  |  |  |  |  |  |  |  |  | (1,525)
Long-lived assets fair value disclosure |  |  |  |  |  |  |  | 6,141 | 58,207 | 5,330 | 25,645 | 3,274 | 5,754 | 8,604 | 6,141 |  |  |  |  |  |  |  |  |  |
Impairment of Real Estate |  | 24,379 | [1] | 51,304 | [1] | 1,156 | [1] |  |  |  |  |  |  | 23,315 |  |  |  |  |  |  | (621) | (1,064) | 1,156 |  |
Real Estate Investment Property, prior to impairment write-down |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,746 |  |  |  |  |  |  |  |  |
Real Estate Investment Property, net |  | 6,328,982 |  | 6,005,670 |  |  |  |  |  |  |  |  |  |  |  | 6,063 |  |  |  |  | 2,098 | 2,250 |  |  |
Non cash loss on impairment of long lived asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,683 | 50,683 | (50,683) | (20,315) | 5,843 | (3,000) |  |  |  |  |
Proceeds from Divestiture of Businesses | $ 12,983 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,477 | $ 1,186 |  |  |
[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.

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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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