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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2014
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax
Changes in accumulated other comprehensive loss, net of tax, for the years ended Dec. 31, 2014 and 2013 were as follows:
 
 
Gains and Losses on Cash Flow Hedges
(Thousands of Dollars)
 
Year Ended Dec. 31, 2014
 
Year Ended Dec. 31, 2013
Accumulated other comprehensive loss at Jan. 1
 
$
(23,338
)
 
$
(22,871
)
Other comprehensive (loss) income before reclassifications
 
(72
)
 
9

Gains reclassified from net accumulated other comprehensive loss
 
(468
)
 
(476
)
Net current period other comprehensive loss
 
(540
)
 
(467
)
Accumulated other comprehensive loss at Dec. 31
 
$
(23,878
)
 
$
(23,338
)
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the years ended Dec. 31, 2014 and 2013 were as follows:
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Year Ended Dec. 31, 2014
 
Year Ended Dec. 31, 2013
 
Gains on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
(730
)
(a) 
$
(730
)
(a) 
Vehicle fuel derivatives
 
(25
)
(b) 
(40
)
(b) 
Total, pre-tax
 
(755
)
 
(770
)
 
Tax expense
 
287

 
294

 
Total amounts reclassified, net of tax
 
$
(468
)
 
$
(476
)
 

(a) 
Included in interest charges.
(b) 
Included in O&M expenses.