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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Summary of Company's Property and Equipment

The following table summarizes the Company’s property and equipment at December 31 of the following years:

 

     2015      2014  
     (Thousands of dollars)  

Flight equipment

    $ 1,096,986       $ 1,053,640   

Facility & improvements

      61,330         61,246   

Operating equipment

      26,004         24,764   

Data processing equipment

      33,178         32,374   

Vehicles

      8,461         8,133   

Medical equipment

      7,514         7,377   

Other

      5,377         5,332   
  

 

 

     

 

 

  
     1,238,850         1,192,866   

Less accumulated depreciation and amortization

      (355,321 )       (315,048 ) 
  

 

 

     

 

 

  

Property and equipment, net

    $ 883,529       $ 877,818