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Commitments and Contingencies: (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies:  
Schedule of future minimum rental payments by the Company

 

Year Ending December 31,
   
 

2012

  $ 14,641  

2013

    14,774  

2014

    13,584  

2015

    12,441  

2016

    12,475  

Thereafter

    778,808  
       

 

  $ 846,723