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Stockholders' Equity: (Details) (Freehold Raceway Mall and Chandler Fashion Center, USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2012 | Sep. 30, 2009 | Dec. 31, 2011 | Jun. 30, 2012 | Apr. 10, 2012
Freehold Raceway Mall and Chandler Fashion Center |  |  |  |  |
Warrants: |  |  |  |  |
Aggregate number of common shares available for purchase under warrants |  | 935,358 |  |  |
Value of stock warrants |  | $ 6,496 |  |  |
Exercise price of stock warrants (in dollars per share) |  | $ 46.68 |  |  |
Number of shares of warrants exercised |  |  | 311,786 |  | 311,786
Exercise of stock warrants | $ 3,448 |  | $ 1,278 |  |
Number of shares of warrants unexercised |  |  |  | 311,786 |

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