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Quarterly Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment of real estate |  |  |  |  |  |  |  |  | $ 24,379 | [1] | $ 51,304 | [1] | $ 1,156 | [1]
Total Revenues | 278,005 | 256,359 | 251,844 | 246,469 | 264,546 | 264,699 | 258,039 | 262,678 | 1,032,677 |  | 1,049,962 |  | 1,043,818 |
Income from operations | 95,999 | 96,331 | 94,400 | 91,702 | 113,349 | 51,257 | 96,041 | 97,933 | 378,432 |  | 358,580 |  | 400,849 |
Income from continuing operations | 84,429 | 37,425 | 36,100 | 34,533 | 110,325 | (18,499) | 32,813 | 36,283 | 192,487 |  | 160,922 | [1] | 133,619 | [1]
Discontinued operations | 1,654 | (24,933) | 3,293 | 2,018 | (451) | 179 | (3,281) | 27,625 | (17,968) |  | 24,072 |  |  |
Net income (loss) | 86,083 | 12,492 | 39,393 | 36,551 | 109,874 | (18,320) | 29,532 | 63,908 | 174,519 |  | 184,994 |  | 98,170 |
Net income (loss) attributable to the Company | 68,086 | 8,074 | 29,391 | 26,049 | 82,967 | (16,726) | 20,376 | 47,319 | 131,600 |  | 133,936 |  | 62,151 |
Net income (loss) available to common shareholders | $ 52,357 | $ (2,520) | $ 18,797 | $ 15,455 | $ 72,373 | $ (27,320) | $ 9,782 | $ 36,725 | $ 84,089 |  | $ 91,560 |  | $ 29,532 |
Basic per share data attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of preferred dividends | $ 0.32 | $ 0.11 | $ 0.11 | $ 0.09 | $ 0.49 | $ (0.19) | $ 0.08 | $ 0.11 | $ 0.64 | [2] | $ 0.49 |  | $ 0.40 |
Net income (loss) attributable to common shareholders | $ 0.33 | $ (0.02) | $ 0.12 | $ 0.10 | $ 0.49 | $ (0.18) | $ 0.07 | $ 0.25 | $ 0.54 | [2] | $ 0.62 |  | $ 0.21 |
Diluted per share data attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of preferred dividends | $ 0.32 | $ 0.11 | $ 0.11 | $ 0.09 | $ 0.49 | $ (0.19) | $ 0.08 | $ 0.11 | $ 0.64 | [2] | $ 0.49 |  | $ 0.40 |
Net income (loss) attributable to common shareholders | $ 0.33 | $ (0.02) | $ 0.12 | $ 0.10 | $ 0.49 | $ (0.18) | $ 0.07 | $ 0.25 | $ 0.54 | [2] | $ 0.62 |  | $ 0.21 |
[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] | The sum of quarterly earnings per share may differ from annual earnings per share due to rounding.

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration