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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2013
Income Tax Disclosure [Abstract]  
Income tax expense reconciliation

Income tax expense differs from the amount computed by applying the statutory rate on book income subject to tax for the following reasons:

 

    (Thousands of Dollars)
    Years Ended December 31,
    2013   2012   2011
Income Tax at Statutory Rate   $ 8,638     $ 7,420     $ 6,816  
Tax Effect of:                        
  Utility Plant Related     (527 )     (442 )     (620 )
  State Income Taxes – Net     546       420       305  
  Employee Benefits     (46 )     (23 )     1  
  Other     10       8       25  
Total Income Tax Expense   $ 8,621     $ 7,383     $ 6,527  
Income tax expense

Income tax expense is comprised of the following:

 

   (Thousands of Dollars)
   Years Ended December 31,
   2013  2012  2011
Current:               
   Federal  $5,018   $2,994   $3,550 
   State   688    430    395 
Deferred:               
   Federal   2,855    3,832    2,594 
   State   139    206    67 
   Investment Tax Credits   (79)   (79)   (79)
Total Income Tax Expense  $8,621   $7,383   $6,527 

 
Deferred tax liability

The components of the net deferred tax liability are as follows:

 

   (Thousands of Dollars)
   December 31,
   2013  2012
Utility Plant Related  $41,912   $39,020 
Customer Advances   (3,598)   (3,673)
Employee Benefits   1,121    6,523 
Investment Tax Credits (ITC)   989    1,068 
Other   (325)   (94)
Total Deferred Tax Liability and ITC  $40,099   $42,844