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Quarterly Financial Data (Unaudited): (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended | 12 Months Ended | 0 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 | Dec. 31, 2011 SDG Properties | Oct. 03, 2012 FlatIron Crossing | Dec. 31, 2012 FlatIron Crossing | Oct. 26, 2012 Arrowhead Towne Center | Dec. 31, 2012 Arrowhead Towne Center
Quarterly Financial Data (Unaudited): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 251,165 | $ 215,669 | $ 204,545 | $ 214,729 | $ 208,479 | $ 193,319 | $ 181,299 | $ 185,265 | $ 881,323 | $ 763,371 | $ 711,557 |  |  |  |  |
Net income (loss) attributable to common stockholders | 174,247 | 43,893 | 133,354 | (14,068) | 163,107 | 12,941 | (19,216) | 34 | 337,426 | 156,866 | 25,190 |  |  |  |  |
Net income (loss) attributable to common stockholders per share-basic (in dollars per share) | $ 1.27 | $ 0.33 | $ 1.00 | $ (0.11) | $ 1.23 | $ 0.10 | $ (0.15) |  | $ 2.51 | $ 1.18 | $ 0.19 |  |  |  |  |
Net income (loss) attributable to common stockholders per share-diluted (in dollars per share) | $ 1.27 | $ 0.33 | $ 1.00 | $ (0.11) | $ 1.23 | $ 0.10 | $ (0.15) |  | $ 2.51 | $ 1.18 | $ 0.19 |  |  |  |  |
Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain on acquisition of additional interest |  |  |  |  |  |  |  |  | 115,729 |  |  |  | 84,227 | 84,227 | 115,729 | 115,729
Remeasurement gain on acquisition of additional interest |  |  |  |  |  |  |  |  | 29,301 | 389,707 | 576 | 188,264 |  |  |  |
Impairment loss related to the reduction of the expected holding period of certain long-lived assets |  |  |  |  |  |  |  |  |  | $ 25,216 |  |  |  |  |  |

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