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Related Party Transactions: (Tables)
6 Months Ended
Jun. 30, 2013
Related Party Transactions:  
Schedule of fees charged to unconsolidated joint ventures

  For the Three Months
Ended June 30,
  For the Six Months
Ended June 30,
 
 
  2013   2012   2013   2012  

Management Fees

  $ 5,506   $ 5,861   $ 11,000   $ 11,909  

Development and Leasing Fees

    2,779     3,631     4,475     6,854  
                   

 

  $ 8,285   $ 9,492   $ 15,475   $ 18,763