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Property: (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Feb. 28, 2011 Desert Sky Mall | Jun. 30, 2011 Desert Sky Mall | Jun. 30, 2011 Superstition Springs Land [Member] | Jun. 30, 2011 Superstition Springs Land [Member] | Jun. 30, 2011 Superstition Springs Land [Member]
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |
Write off of development cost | $ 4,204 | $ 447 | $ 5,242 | $ 484 |  | $ 38 |  |  |
Remeasurement gain on acquisition of additional interest |  |  |  |  | $ 1,838 | $ 1,838 | $ 1,734 | $ 1,734 | $ 1,734
Ownership percentage purchased |  |  |  |  | 50.00% | 50.00% | 50.00% |  |

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