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Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2014 and 2013 were as follows:
 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Three Months Ended June 30, 2014
 
Three Months Ended June 30, 2013
Accumulated other comprehensive loss at April 1
 
$
(23,461
)
 
$
(22,982
)
Other comprehensive gain (loss) before reclassifications
 
5

 
(20
)
Gains reclassified from net accumulated other comprehensive loss
 
(117
)
 
(118
)
Net current period other comprehensive loss
 
(112
)
 
(138
)
Accumulated other comprehensive loss at June 30
 
$
(23,573
)
 
$
(23,120
)

 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Six Months Ended June 30, 2014
 
Six Months Ended June 30, 2013
Accumulated other comprehensive loss at Jan. 1
 
$
(23,338
)
 
$
(22,871
)
Other comprehensive gain (loss) before reclassifications
 
2

 
(13
)
Gains reclassified from net accumulated other comprehensive loss
 
(237
)
 
(236
)
Net current period other comprehensive loss
 
(235
)
 
(249
)
Accumulated other comprehensive loss at June 30
 
$
(23,573
)
 
$
(23,120
)
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the three and six months ended June 30, 2014 and 2013 were as follows:
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended June 30, 2014
 
Three Months Ended June 30, 2013
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
(182
)
(a) 
$
(182
)
(a) 
Vehicle fuel derivatives
 
(7
)
(b) 
(7
)
(b) 
Total, pre-tax
 
(189
)
 
(189
)
 
Tax expense
 
72

 
71

 
Total amounts reclassified, net of tax
 
$
(117
)
 
$
(118
)
 
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Six Months Ended June 30, 2014
 
Six Months Ended June 30, 2013
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
(362
)
(a) 
$
(362
)
(a) 
Vehicle fuel derivatives
 
(20
)
(b) 
(19
)
(b) 
Total, pre-tax
 
(382
)
 
(381
)
 
Tax expense
 
145

 
145

 
Total amounts reclassified, net of tax
 
$
(237
)
 
$
(236
)
 

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