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Discontinued Operations: (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended |  | 0 Months Ended | 1 Months Ended |  | 0 Months Ended |  | 0 Months Ended
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Dec. 11, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 04, 2013 Mervyn's | Oct. 23, 2013 Mervyn's | Oct. 15, 2013 Mervyn's | Sep. 11, 2013 Mervyn's | May 11, 2012 Mervyn's | Nov. 30, 2011 Mervyn's | Oct. 14, 2011 Mervyn's | Mar. 04, 2011 Mervyn's | Dec. 29, 2011 Shoppingtown Mall | Jun. 30, 2011 Shoppingtown Mall | Apr. 23, 2012 Valley View Mall | Mar. 31, 2012 Valley View Mall | Apr. 30, 2012 The Borgata sqft | May 17, 2012 Hilton Village sqft | May 31, 2013 Prescott Gateway | May 31, 2012 Prescott Gateway sqft | Jun. 28, 2012 Carmel Plaza sqft | Sep. 30, 2013 Fiesta Mall | Dec. 31, 2012 Fiesta Mall | Dec. 31, 2013 Fiesta Mall sqft | May 31, 2013 Green Tree Mall sqft | Jun. 04, 2013 Northridge Mall sqft | Jun. 04, 2013 Rimrock Mall sqft | Jun. 04, 2013 Rimrock Mall and Nortridge Mall | Dec. 11, 2013 Chesterfield Towne Center sqft | Dec. 11, 2013 Centre at Salisbury sqft | Jun. 03, 2011 GGP Exchange store | Mar. 04, 2011 GGP Exchange Mervyn's entity
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale | $ 292,500 |  |  |  | $ 10,475 | $ 5,430 | $ 5,700 | $ 12,000 | $ 20,750 | $ 2,300 | $ 8,061 | $ 3,732 |  |  |  |  | $ 9,150 | $ 24,820 |  |  | $ 52,000 |  |  |  | $ 79,000 |  |  | $ 230,000 |  |  |  |
Gain (loss) from sale |  | 286,414 | 50,811 | (58,333) | (5,257) | 1,695 | (2,031) | (2,633) | (407) | (200) | 3,783 | (1,913) |  |  |  |  | (1,275) | 3,127 |  |  | 7,844 |  |  |  | 59,767 |  |  | 82,151 |  |  |  |
Proceeds from Divestiture of Business, Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,763 |  |  |
Proceeds from Divestiture of Business, Assumption of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,737 | 115,000 |  |
Number of anchor locations exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 5
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,729 |  | 54,306 |  |  |  |  |  |  | (24,555) |  |  |  |  |  |  |  |  |
Property square footage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,000 | 80,000 |  | 584,000 | 112,000 |  |  | 933,000 | 793,000 | 890,000 | 603,000 |  | 1,016,000 | 862,000 |  |
Long-lived assets written off to fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,968 | 33,450 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | 1,432 | 0 | (1,485) |  |  |  |  |  |  |  |  | (3,929) |  | 104,023 |  |  |  | 16,296 |  |  | 1,252 |  |  |  |  |  |  |  |  |  |
Revenues from discontinued operations |  | 54,752 | 94,406 | 118,558 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) income from discontinued operations |  | $ 289,936 | $ 63,223 | $ (70,367) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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