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Commitments and Contingencies: (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Future Minimum Lease Payments Under Non Cancelable Operating Leases

Future minimum lease payments under non-cancelable operating leases as of December 31, 2012 are as follows (in thousands):

 

2013

   $ 20,960   

2014

     16,268   

2015

     12,052   

2016

     8,337   

2017

     5,420   

Thereafter

     10,915   
  

 

 

 
   $ 73,952