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Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2017
Incentive Plans [Abstract]  
Information Relating to Stock Options Outstanding
Information relating to the Company's 1993 Plan is as follows:

  
Year Ended
 
(shares in thousands)
 
December 31, 2017
 
December 31, 2016
 
 
     
Stock option grants
  
   
 
Stock options exercisable
  
   
 
Stock options outstanding