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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Income Taxes [Abstract]  
Income tax expense reconciliation

 

    (Thousands of Dollars)
    Years Ended December 31,
    2015   2014   2013
Income Tax at Statutory Rate   $ 10,703     $ 9,786     $ 8,638  
Tax Effect of:                        
  Utility Plant Related     (920     (572 )     (527 )
  State Income Taxes – Net     745       711       546  
  Employee Benefits     7
    (6 )     (46 )
  Other     16       18       10  
Total Income Tax Expense   $ 10,551     $ 9,937     $ 8,621  
Income tax expense

 

    (Thousands of Dollars)
    Years Ended December 31,
    2015   2014   2013
Current:                        
   Federal   $ (15,203   $ 5,920     $ 5,018  
   State     1,153       887       688  
Deferred:                        
   Federal     24,686       3,018       2,855  
   State     (6     191       139  
   Investment Tax Credits     (79     (79     (79 )
Total Income Tax Expense   $ 10,551     $ 9,937     $ 8,621  
Deferred tax liability
    (Thousands of Dollars)
    December 31,
    2015     2014  
Utility Plant Related   $ 63,281     $ 43,996  
Customer Advances     (3,510     (3,570
Employee Benefits     5,796       7,223  
Investment Tax Credits (ITC)     832       910  
Net Operating Loss Carryforwards     2,311        
Other     (176     (343
Total Deferred Tax Liability and ITC   $ 68,534     $ 48,216