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Operating Partnership (Condensed Consolidated Statements of Operations) (Details) (USD $) In Thousands, 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
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 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (265,192) | (270,828) |  | (279,936) |
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 |
Interest and other income |  |  |  |  |  |  |  |  | 3,955 | 2,582 |  | 3,868 |
Interest expense |  |  |  |  |  |  |  |  | (244,432) | (267,072) |  | (281,102) |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  | 265 | 1,029 |  | 0 |
Gains on Sales of Investment Real Estate |  |  |  |  |  |  |  |  | 2,286 | 59,396 |  | 2,887 |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 8,313 | 6,138 |  | (188) |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (1,404) | 269 |  | 6,417 |
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]
Operating income (loss) of discontinued operations |  |  |  |  |  |  |  |  | (18,906) | 24,073 |  | (35,828) |
Gain (loss) on discontinued operations |  |  |  |  |  |  |  |  | 938 | (1) |  | 379 |
Net income | 86,083 | 12,492 | 39,393 | 36,551 | 109,874 | (18,320) | 29,532 | 63,908 | 174,519 | 184,994 |  | 98,170 |
Noncontrolling interest in earnings of other consolidated subsidiaries |  |  |  |  |  |  |  |  | (23,652) | (25,217) |  | (25,001) |
Net income (loss) attributable to partners of the operating partnership |  |  |  |  |  |  |  |  | (19,267) | (25,841) |  | (11,018) |
Operating Partnership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,032,677 | 1,049,961 |  | 1,043,818 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (265,192) | (270,828) |  | (279,936) |
Other operating expenses |  |  |  |  |  |  |  |  | (389,053) | (420,554) |  | (363,033) |
Income from operations |  |  |  |  |  |  |  |  | 378,432 | 358,579 |  | 400,849 |
Interest and other income |  |  |  |  |  |  |  |  | 3,955 | 2,583 |  | 3,909 |
Interest expense |  |  |  |  |  |  |  |  | (244,432) | (267,072) |  | (281,101) |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  | 265 | 1,029 |  | 0 |
Gain on investments |  |  |  |  |  |  |  |  | 45,072 | 0 |  | 888 |
Gains on Sales of Investment Real Estate |  |  |  |  |  |  |  |  | 2,286 | 59,396 |  | 2,887 |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 8,313 | 6,138 |  | (188) |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (1,404) | 269 |  | 6,417 |
Income from continuing operations |  |  |  |  |  |  |  |  | 192,487 | 160,922 |  | 133,661 |
Operating income (loss) of discontinued operations |  |  |  |  |  |  |  |  | (18,906) | 24,073 |  | (35,828) |
Gain (loss) on discontinued operations |  |  |  |  |  |  |  |  | 938 | (1) |  | 379 |
Net income |  |  |  |  |  |  |  |  | 174,519 | 184,994 |  | 98,212 |
Noncontrolling interest in earnings of other consolidated subsidiaries |  |  |  |  |  |  |  |  | (23,652) | (25,217) |  | (25,001) |
Net income (loss) attributable to partners of the operating partnership |  |  |  |  |  |  |  |  | $ 150,867 | $ 159,777 |  | $ 73,211 |
[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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