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Stockholders' Equity: (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended
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Dec. 31, 2011 FlatIron Crossing | Sep. 30, 2009 Freehold Raceway Mall and Chandler Fashion Center D
Warrants: |  |
Aggregate number of common shares available for purchase under warrants |  | 935,358
Value of stock warrants |  | $ 6,496
Exercise of stock warrants | $ 1,278 |
Expiration period of exercisable stock warrants following refinancing or repayment of related loans (in days) |  | 30
Exercise price of stock warrants (in dollars per share) |  | $ 46.68
Number of shares of warrants exercised | 311,786 |

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