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Other Comprehensive Income
 9 Months Ended
Sep. 30, 2015
Stockholders' Equity Note [Abstract]  
Other Comprehensive Income
Other Comprehensive Income

Changes in accumulated other comprehensive loss, net of tax, for the three and nine months ended Sept. 30, 2015 and 2014 were as follows:
 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Three Months Ended Sept. 30, 2015
 
Three Months Ended Sept. 30, 2014
Accumulated other comprehensive loss at July 1
 
$
(24,086
)
 
$
(23,573
)
Other comprehensive loss before reclassifications
 
(17
)
 
(17
)
Losses (gains) reclassified from net accumulated other comprehensive loss
 
19

 
(119
)
Net current period other comprehensive income (loss)
 
2

 
(136
)
Accumulated other comprehensive loss at Sept. 30
 
$
(24,084
)
 
$
(23,709
)

 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Nine Months Ended Sept. 30, 2015
 
Nine Months Ended Sept. 30, 2014
Accumulated other comprehensive loss at Jan. 1
 
$
(23,878
)
 
$
(23,338
)
Other comprehensive loss before reclassifications
 
(14
)
 
(15
)
Gains reclassified from net accumulated other comprehensive loss
 
(192
)
 
(356
)
Net current period other comprehensive loss
 
(206
)
 
(371
)
Accumulated other comprehensive loss at Sept. 30
 
$
(24,084
)
 
$
(23,709
)
 
 
 
 
 

Reclassifications from accumulated other comprehensive loss for the three and nine months ended Sept. 30, 2015 and 2014 were as follows:
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended Sept. 30, 2015
 
Three Months Ended Sept. 30, 2014
 
Losses (gains) on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
9

(a) 
$
(184
)
(a) 
Vehicle fuel derivatives
 
15

(b) 
(7
)
(b) 
Total, pre-tax
 
24

 
(191
)
 
Tax expense
 
(5
)
 
72

 
Total amounts reclassified, net of tax
 
$
19

 
$
(119
)
 
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Nine Months Ended Sept. 30, 2015
 
Nine Months Ended Sept. 30, 2014
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
(353
)
(a) 
$
(546
)
(a) 
Vehicle fuel derivatives
 
38

(b) 
(27
)
(b) 
Total, pre-tax
 
(315
)
 
(573
)
 
Tax expense
 
123

 
217

 
Total amounts reclassified, net of tax
 
$
(192
)
 
$
(356
)
 
 
 
 
 
 
 
(a) 
Included in interest charges.
(b) 
Included in O&M expenses.