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Capitalization (Tables)
 12 Months Ended
Dec. 31, 2015
Capitalization [Abstract]  
Schedule of maturities of long term debt
Year  

(Millions of Dollars)
Annual Maturities
2016 $ 5.7
2017 $ 6.0
2018 $ 6.4
2019 $ 6.4
2020 $ 6.3
Schedule of earnings per share

 

    (In Thousands, Except Per Share Amounts)
    2015   2014   2013
Basic:   Income   Shares   Income   Shares   Income   Shares
Net Income   $ 20,028       16,175     $ 18,445       16,052     $ 16,633       15,868  
Preferred Dividend     (144 )              (151 )             (190 )        
Earnings Applicable to Common Stock   $ 19,884       16,175     $ 18,294       16,052     $ 16,443       15,868  
Basic EPS   $ 1.23             $ 1.14             $ 1.04          
Diluted:                                                
Earnings Applicable to Common Stock   $ 19,884       16,175     $ 18,294       16,052     $ 16,443       15,868  
$7.00 Series Dividend     67       115       74       133       97       166  
$8.00 Series Dividend     24       41       24       41       40       76  
Adjusted Earnings Applicable to Common Stock   $ 19,975       16,331     $ 18,392       16,226     $ 16,580       16,110  
Diluted EPS   $ 1.22             $ 1.13             $ 1.03          

Schedule of carrying amount and estimated fair value of bonds

 

    (Thousands of Dollars)
    At December 31,
    2015   2014
    Carrying   Fair   Carrying   Fair
    Amount   Value   Amount   Value
Bonds   $ 85,143     $ 87,972     $ 88,628     $ 90,115  
State Revolving Notes   $ 457     $ 459     $ 540     $ 542