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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2017
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 months ended March 31, 2017 and 2016 were as follows:
 
 
 
 
 
 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Three Months Ended March 31, 2017
 
Three Months Ended March 31, 2016
Accumulated other comprehensive loss at Jan. 1
 
$
(133
)
 
$
(209
)
Losses reclassified from net accumulated other comprehensive loss
 
19

 
19

Net current period other comprehensive income
 
19

 
19

Accumulated other comprehensive loss at March 31
 
$
(114
)
 
$
(190
)
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the three months ended March 31, 2017 and 2016 were as follows:
 
 
 
 
 
 
 
 
Amounts Reclassified from
Accumulated Other
Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended March 31, 2017
 
Three Months Ended March 31, 2016
 
Losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
31

(a) 
$
32

(a) 
Total, pre-tax
 
31

 
32

 
Tax benefit
 
(12
)
 
(13
)
 
Total amounts reclassified, net of tax
 
$
19

 
$
19

 

(a) 
Included in interest charges.