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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2017
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, 
   2017   2016   2015 
Income Tax at Statutory Rate  $11,868   $12,007   $10,703 
Tax Effect of:               
  Utility Plant Related   (1,016)   (1,059)   (920)
  State Income Taxes – Net   895    770    745 
  Tax Act    (610)   —    — 
  Employee Benefits   (43)   (5)   7 
  Other   6    22    16 
Total Income Tax Expense  $11,100   $11,735   $10,551 

 
Income tax expense

Income tax expense is comprised of the following:

 

   (Thousands of Dollars) 
   Years Ended December 31, 
   2017   2016   2015 
Current:            
   Federal  $2,090   $7,305   $(15,203)
   State   1,066    877    1,153 
Deferred:               
   Federal   7,713    3,325    24,686 
   State   310    307    (6)
   Investment Tax Credits   (79)   (79)   (79)
Total Income Tax Expense  $11,100   $11,735   $10,551
Deferred tax liability

Deferred income taxes reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial purposes and the amounts used for income tax purposes. The components of the net deferred tax liability are as follows:

 

   (Thousands of Dollars) 
   December 31, 
   2017   2016 
Utility Plant Related  $41,259   $69,019 
Customer Advances   (3,749)   (3,430)
Employee Benefits   4,903    6,904 
Investment Tax Credits (ITC)   675    753 
Other   72    (421)
Total Deferred Tax Liability and ITC  $43,160   $72,825