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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2016
Income Tax Disclosure [Abstract]  
Income tax expense reconciliation

 

   (Thousands of Dollars)
   Years Ended December 31,
   2016  2015  2014
Income Tax at Statutory Rate  $12,007   $10,703   $9,786 
Tax Effect of:               
  Utility Plant Related   (1,059)   (920)   (572)
  State Income Taxes – Net   770    745    711 
  Employee Benefits   (5)   7    (6)
  Other   22    16    18 
Total Income Tax Expense  $11,735   $10,551   $9,937 

 

Income tax expense

 

   (Thousands of Dollars)
   Years Ended December 31,
   2016  2015  2014
Current:               
   Federal  $7,305   $(15,203)  $5,920 
   State   877    1,153    887 
Deferred:               
   Federal   3,325    24,686    3,018 
   State   307    (6)   191 
   Investment Tax Credits   (79)   (79)   (79)
Total Income Tax Expense  $11,735   $10,551   $9,937 

 

Deferred tax liability

 

   (Thousands of Dollars)
   December 31,
   2016  2015
Utility Plant Related  $69,019   $63,281 
Customer Advances   (3,430)   (3,510)
Employee Benefits   6,904    5,796 
Investment Tax Credits (ITC)   753    832 
Net Operating Loss Carryforwards       2,311 
Other   (421)   (176)
Total Deferred Tax Liability and ITC  $72,825   $68,534