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Discontinued Operations: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | May 31, 2012 Mervyn's | Nov. 30, 2011 Mervyn's | Oct. 31, 2011 Mervyn's | Mar. 31, 2011 Mervyn's | Dec. 31, 2011 Shoppingtown Mall | Jun. 29, 2011 Shoppingtown Mall | Apr. 30, 2012 Valley View Mall | Mar. 31, 2012 Valley View Mall | Apr. 30, 2012 The Borgata squarefoot | May 31, 2012 Hilton Village. | May 17, 2012 Hilton Village. squarefoot | May 31, 2012 Prescott Gateway squarefoot | Jun. 30, 2012 Carmel Plaza | Jun. 28, 2012 Carmel Plaza squarefoot | Jun. 30, 2011 GGP Exchange store | Jun. 30, 2011 GGP Exchange Mervyn's entity
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  | $ 20,750 | $ 2,300 | $ 8,061 | $ 3,732 |  |  |  |  | $ 9,150 | $ 24,820 |  |  | $ 52,000 |  |  |
Gain (loss) from sale | (253) | 342 | 74,906 | (37,648) | (407) | (200) | 3,783 | (1,913) |  |  |  |  | (1,275) | 3,127 |  |  | 7,844 |  |  |
Number of anchor locations exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 5
Impairment charge |  |  |  |  |  |  |  |  |  | 35,729 |  | 54,306 |  |  |  |  |  |  |  |
Long-lived assets written off to fair value |  |  |  |  |  |  |  |  |  | 38,968 |  | 33,450 |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | (9,133) |  |  |  |  | (3,929) |  | 104,033 |  |  |  |  | 16,296 |  |  |  |
Property square footage |  |  |  |  |  |  |  |  |  |  |  |  | 93,693 |  | 79,814 | 583,959 |  | 111,945 |  |
Revenues from discontinued operations | 1 | 9,364 | 10,599 | 30,641 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income from discontinued operations | $ (263) | $ (4,556) | $ 69,447 | $ (50,508) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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