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Related-Party Transactions: (Tables)
12 Months Ended
Dec. 31, 2011
Related-Party Transactions:  
Schedule of fees charged to unconsolidated joint ventures

Management Fees

  $ 26,838   $ 26,781   $ 24,323  

Development and Leasing Fees

    9,955     11,488     9,228  
               

 

  $ 36,793   $ 38,269   $ 33,551