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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Commitments and Contingencies [Abstract]  
Summary of Rental expense incurred under the leases
                         
    Year Ended     Year Ended     Year Ended  
    December 31,     December 31,     December 31,  
    2012     2011     2010  
    (Thousands of dollars)  

Aircraft

  $ 36,240     $ 25,408     $ 30,219  

Other

    8,081       7,150       7,258  
   

 

 

   

 

 

   

 

 

 

Total

  $ 44,321     $ 32,558     $ 37,477  
   

 

 

   

 

 

   

 

 

 
Summary of remaining aggregate lease commitments under operating leases having initial non-cancelable terms in excess of one year
                         
    Aircraft     Other     Total  
    (Thousands of dollars)  

2013

  $ 39,137     $ 3,941     $ 43,078  

2014

    39,137       3,359       42,496  

2015

    38,860       2,908       41,768  

2016

    31,964       2,592       34,556  

2017

    22,095       2,145       24,240  

Thereafter

    27,495       4,681       32,176  
   

 

 

   

 

 

   

 

 

 
    $ 198,688     $ 19,626     $ 218,314