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Quarterly Data - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial information

Financial information for each quarter of 2018 and 2017 is as follows:

 

   (Thousands of Dollars, Except per Share Data)
2018  1st  2nd  3rd  4th  Total
                
Operating Revenues  $31,177   $34,919   $38,713   $33,268   $138,077 
Operating Income   6,350    10,721    12,918    7,153    37,142 
Net Income   4,494    8,675    12,290    6,993    32,452 
Basic Earnings per Share  $0.27   $0.52   $0.75   $0.43   $1.97 
Diluted Earnings per Share  $0.27   $0.52   $0.74   $0.43   $1.96 
Common Dividend Per Share  $0.2238   $0.2238   $0.2238   $0.2400   $0.9114 
High/Low Common Stock Price  $41.45/$33.96   $45.24/$34.74   $49.00/$41.77   $60.31/$43.12      
                          

 

2017  1st  2nd  3rd  4th  Total
                
Operating Revenues  $ 30, 131    $33,014   $36,174   $ 31, 456    $130,775 
Operating Income   7,575    9,358    12,601    8,264    37,798 
Net Income   4,441    5,381    7,642    5,345    22,809 
Basic Earnings per Share  $0.27   $0.33   $0.47   $0.32   $1.39 
Diluted Earnings per Share  $0.27   $0.33   $0.46   $0.32   $1.38 
Common Dividend Per Share  $0.2113   $0.2113   $0.2113   $0.2238   $0.8577 
High/Low Common Stock Price  $42.80/$34.55   $41.50/$32.23   $40.87/$36.99   $46.74/$39.10