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Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2013
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, 2013 were as follows:
(Thousands of Dollars)
 
Gains and
Losses on Cash
Flow Hedges
Accumulated other comprehensive loss at April 1
 
$
(22,982
)
Other comprehensive loss before reclassifications
 
(20
)
Gains reclassified from net accumulated other comprehensive loss
 
(118
)
Net current period other comprehensive loss
 
(138
)
Accumulated other comprehensive loss at June 30
 
$
(23,120
)
(Thousands of Dollars)
 
Gains and
Losses on Cash
Flow Hedges
Accumulated other comprehensive loss at Jan. 1
 
$
(22,871
)
Other comprehensive loss before reclassifications
 
(13
)
Gains reclassified from net accumulated other comprehensive loss
 
(236
)
Net current period other comprehensive loss
 
(249
)
Accumulated other comprehensive loss at June 30
 
$
(23,120
)
Reclassifications from Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the three and six months ended June 30, 2013 were as follows:
 
 
Amounts Reclassified from
Accumulated Other
Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended June 30, 2013
 
Six Months Ended June 30, 2013
 
Gains on cash flow hedges:
 
 

 
 
 
Interest rate derivatives
 
$
182

(a) 
$
362

(a) 
Vehicle fuel derivatives
 
7

(b) 
19

(b) 
Total, pre-tax
 
189

 
381


Tax expense
 
(71
)
 
(145
)
 
Total amounts reclassified, net of tax
 
$
118

 
$
236



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