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Quarterly Financial Data (Unaudited): (Details) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 SDG Macerich Properties, L. P. | Dec. 31, 2011 SDG Macerich Properties, L. P. | Dec. 31, 2010 SDG Macerich Properties, L. P. | Dec. 31, 2009 SDG Macerich Properties, L. P.
Quarterly Financial Data (Unaudited): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 215,315,000 | $ 202,683,000 | $ 190,940,000 | $ 191,069,000 | $ 200,334,000 | $ 189,471,000 | $ 181,226,000 | $ 182,114,000 | $ 791,250,000 | $ 743,393,000 | $ 793,048,000 |  |  |  |
Net income (loss) available to common stockholders | 163,107,000 | 12,941,000 | (19,216,000) | 34,000 | 23,558,000 | 8,429,000 | (440,000) | (6,357,000) | 156,866,000 | 25,190,000 | 120,742,000 |  |  |  |
Net income (loss) available to common stockholders per share-basic (in dollars per share) | $ 1.23 | $ 0.10 | $ (0.15) |  | $ 0.18 | $ 0.06 | $ (0.01) | $ (0.08) | $ 1.18 | $ 0.19 | $ 1.45 |  |  |  |
Net income (loss) available to common stockholders per share-diluted (in dollars per share) | $ 1.23 | $ 0.10 | $ (0.15) |  | $ 0.18 | $ 0.06 | $ (0.01) | $ (0.08) | $ 1.18 | $ 0.19 | $ 1.45 |  |  |  |
Impairment loss related to the reduction of the expected holding period of certain long-lived assets |  |  |  |  |  |  |  |  | 45,458,000 |  |  |  |  |  |
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain on acquisition of additional interest |  |  |  |  |  |  |  |  | $ 389,707,000 | $ 576,000 | $ (3,016,000) | $ 188,264 | $ 366,312,000 | $ 6,000 | $ (931,000)

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