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Property: (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Fiesta Mall | Feb. 28, 2011 Desert Sky Mall | Dec. 31, 2011 Desert Sky Mall | Jun. 30, 2011 Superstition Springs Land | Dec. 31, 2011 Superstition Springs Land | Jun. 03, 2011 Superstition Springs Land | Oct. 03, 2012 FlatIron Crossing | Dec. 31, 2012 FlatIron Crossing | Oct. 26, 2012 Arrowhead Towne Center | Dec. 31, 2012 Arrowhead Towne Center
Purchase of interest in property |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain on acquisition of additional interest | $ 115,729 |  |  |  | $ 1,868 | $ 1,868 | $ 1,734 | $ 1,734 |  | $ 84,227 | $ 84,227 | $ 115,729 | $ 115,729
Ownership percentage purchased |  |  |  |  | 50.00% | 50.00% | 50.00% |  | 50.00% | 75.00% | 75.00% | 33.30% | 33.30%
Write off of development cost | 19,204 |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  | 25,216 |  | 24,555 |  |  |  |  |  |  |  |  |
Loss on sale of assets | $ 390 | $ 423 | $ 497 |  |  |  |  |  |  |  |  |  |

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