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Other Comprehensive Income
 6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Other Comprehensive Income
Other Comprehensive Income

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
 
$
(418
)
Losses reclassified from net accumulated other comprehensive loss
 
18

Net current period other comprehensive income
 
18

Accumulated other comprehensive loss at June 30
 
$
(400
)

(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
 
37

Net current period other comprehensive income
 
37

Accumulated other comprehensive loss at June 30
 
$
(400
)


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
 
Losses on cash flow hedges:
 
 

 
 
 
Interest rate derivatives
 
$
32

(a) 
$
63

(a) 
Total, pre-tax
 
32

 
63

 
Tax benefit
 
(14
)
 
(26
)

Total amounts reclassified, net of tax
 
$
18

 
$
37

 

(a) 
Included in interest charges.