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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 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 year ended Dec. 31, 2013 were as follows:
(Thousands of Dollars)
 
Gains and
Losses on Cash
Flow Hedges
Accumulated other comprehensive loss at Jan. 1
 
$
(22,871
)
Other comprehensive gain before reclassifications
 
9

Gains reclassified from net accumulated other comprehensive loss
 
(476
)
Net current period other comprehensive loss
 
(467
)
Accumulated other comprehensive loss at Dec. 31
 
$
(23,338
)
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the year ended Dec. 31, 2013 were as follows:
(Thousands of Dollars)
 
Amounts Reclassified from
Accumulated Other
Comprehensive Loss
 
Gains on cash flow hedges:
 
 
 
Interest rate derivatives
 
$
(730
)
(a) 
Vehicle fuel derivatives
 
(40
)
(b) 
Total, pre-tax
 
(770
)
 
Tax expense
 
294

 
Total amounts reclassified, net of tax
 
$
(476
)
 

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