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Leases (Tables)
 12 Months Ended
Dec. 31, 2013
Future Minimum Lease Payments

The future minimum lease payments are summarized as follows (in thousands of dollars):

 

2014

      38,348   

2015

      32,250   

2016

      22,018   

2017

      10,752   

2018

      6,132   

2019 and after

      4,721   
  

 

 

  
     114,221