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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 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 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 out of Accumulated Other Comprehensive Loss
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.