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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Summary of Company's property and equipment
                 
    2012     2011  
    (Thousands of dollars)  

Flight equipment

   $ 908,464     $ 811,758  

Facility & improvements

     54,407       45,813  

Operating equipment

     23,929       22,275  

Data processing equipment

     31,956       29,739  

Vehicles

     7,595       7,402  

Medical equipment

     6,991       5,739  

Other

     4,705       3,952  
   

 

 

    

 

 

  
      1,038,047       926,678  

Less accumulated depreciation and amortization

     (288,546 )      (266,922 ) 
   

 

 

    

 

 

  

Property and equipment, net

   $ 749,501     $ 659,756