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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2014
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 and nine months ended Sept. 30, 2014 and 2013 were as follows:
 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Three Months Ended Sept. 30, 2014
 
Three Months Ended Sept. 30, 2013
Accumulated other comprehensive loss at July 1
 
$
(23,573
)
 
$
(23,120
)
Other comprehensive (loss) income before reclassifications
 
(17
)
 
11

Gains reclassified from net accumulated other comprehensive loss
 
(119
)
 
(119
)
Net current period other comprehensive loss
 
(136
)
 
(108
)
Accumulated other comprehensive loss at Sept. 30
 
$
(23,709
)
 
$
(23,228
)

 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Nine Months Ended Sept. 30, 2014
 
Nine Months Ended Sept. 30, 2013
Accumulated other comprehensive loss at Jan. 1
 
$
(23,338
)
 
$
(22,871
)
Other comprehensive loss before reclassifications
 
(15
)
 
(2
)
Gains reclassified from net accumulated other comprehensive loss
 
(356
)
 
(355
)
Net current period other comprehensive loss
 
(371
)
 
(357
)
Accumulated other comprehensive loss at Sept. 30
 
$
(23,709
)
 
$
(23,228
)
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the three and nine months ended Sept. 30, 2014 and 2013 were as follows:
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended Sept. 30, 2014
 
Three Months Ended Sept. 30, 2013
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
(184
)
(a) 
$
(184
)
(a) 
Vehicle fuel derivatives
 
(7
)
(b) 
(11
)
(b) 
Total, pre-tax
 
(191
)
 
(195
)
 
Tax expense
 
72

 
76

 
Total amounts reclassified, net of tax
 
$
(119
)
 
$
(119
)
 
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Nine Months Ended Sept. 30, 2014
 
Nine Months Ended Sept. 30, 2013
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
(546
)
(a) 
$
(546
)
(a) 
Vehicle fuel derivatives
 
(27
)
(b) 
(30
)
(b) 
Total, pre-tax
 
(573
)
 
(576
)
 
Tax expense
 
217

 
221

 
Total amounts reclassified, net of tax
 
$
(356
)
 
$
(355
)
 

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