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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
 
$
(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
)
Reclassification out of 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
 
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.