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Capitalization (Tables)
 12 Months Ended
Dec. 31, 2014
Capitalization [Abstract]  
Schedule of maturities of long term debt
The aggregate annual principal repayment obligations for all long-term debt over the next five years are shown below:
Year  

(Millions of Dollars)
Annual Maturities
2015   $5.9
2016   $6.1
2017   $6.2
2018   $6.3
2019   $6.3
Schedule of earnings per share

The following table presents the calculation of basic and diluted earnings per share (EPS) for the three years ended December 31, 2014. Basic EPS is computed on the basis of the weighted average number of shares outstanding. Diluted EPS assumes the conversion of both the Convertible Preferred Stock $7.00 Series and $8.00 Series.

 

    (In Thousands, Except Per Share Amounts)
    2014   2013   2012
Basic:   Income   Shares   Income   Shares   Income   Shares
Net Income   $ 18,445       16,052     $ 16,633       15,868     $ 14,396       15,733  
Preferred Dividend     (151 )              (190 )             (206 )        
Earnings Applicable to Common Stock   $ 18,294       16,052     $ 16,443       15,868     $ 14,190       15,733  
Basic EPS   $ 1.14             $ 1.04             $ 0.90          
Diluted:                                                
Earnings Applicable to Common Stock   $ 18,294       16,052     $ 16,443       15,868     $ 14,190       15,733  
$7.00 Series Dividend     74       133       97       166       97       166  
$8.00 Series Dividend     24       41       40       76       56       96  
Adjusted Earnings Applicable to Common Stock   $ 18,392       16,226     $ 16,580       16,110     $ 14,343       15,995  
Diluted EPS   $ 1.13             $ 1.03             $ 0.90          

Schedule of carrying amount and estimated fair value of bonds
The carrying amount and fair value of the Company's bonds were as follows:

 

    (Thousands of Dollars)
    At December 31,
    2014   2013
    Carrying   Fair   Carrying   Fair
    Amount   Value   Amount   Value
Bonds   $ 88,628     $ 90,115     $ 87,471     $ 79,733  
State Revolving Notes   $ 540     $ 542     $ 625     $ 628