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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2015
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Loss, Net of Tax
Changes in accumulated other comprehensive loss, net of tax, for the three months ended March 31, 2015 and 2014 were as follows:
 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Three Months Ended March 31, 2015
 
Three Months Ended March 31, 2014
Accumulated other comprehensive loss at Jan. 1
 
$
(23,878
)
 
$
(23,338
)
Other comprehensive loss before reclassifications
 
(5
)
 
(3
)
Gains reclassified from net accumulated other comprehensive loss
 
(105
)
 
(120
)
Net current period other comprehensive loss
 
(110
)
 
(123
)
Accumulated other comprehensive loss at March 31
 
$
(23,988
)
 
$
(23,461
)

 
 
 
 
 
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the three months ended March 31, 2015 and 2014 were as follows:
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended March 31, 2015
 
Three Months Ended March 31, 2014
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
(180
)
(a) 
$
(180
)
(a) 
Vehicle fuel derivatives
 
11

(b) 
(13
)
(b) 
Total, pre-tax
 
(169
)
 
(193
)
 
Tax expense
 
64

 
73

 
Total amounts reclassified, net of tax
 
$
(105
)
 
$
(120
)
 
 
 
 
 
 
 
(a) 
Included in interest charges.
(b) 
Included in O&M expenses.