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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 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 nine months ended Sept. 30, 2013 were as follows:
(Thousands of Dollars)
 
Gains and
Losses on Cash
Flow Hedges
Accumulated other comprehensive loss at July 1
 
$
(400
)
Losses reclassified from net accumulated other comprehensive loss
 
20

Net current period other comprehensive income
 
20

Accumulated other comprehensive loss at Sept. 30
 
$
(380
)

(Thousands of Dollars)
 
Gains and
Losses on Cash
Flow Hedges
Accumulated other comprehensive loss at Jan. 1
 
$
(437
)
Losses reclassified from net accumulated other comprehensive loss
 
57

Net current period other comprehensive income
 
57

Accumulated other comprehensive loss at Sept. 30
 
$
(380
)
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the three and nine months ended Sept. 30, 2013 were as follows:
 
 
Amounts Reclassified from
Accumulated Other
Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended Sept. 30, 2013
 
Nine Months Ended Sept. 30, 2013
 
Losses on cash flow hedges:
 
 

 
 
 
Interest rate derivatives
 
$
32

(a) 
$
95

(a) 
Total, pre-tax
 
32

 
95

 
Tax benefit
 
(12
)
 
(38
)
 
Total amounts reclassified, net of tax
 
$
20

 
$
57

 

(a) 
Included in interest charges.