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Other Comprehensive Income
 3 Months Ended
Mar. 31, 2018
Stockholders' Equity Note [Abstract]  
Other Comprehensive Income
Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive loss, net of tax, for the three months ended March 31, 2018 and 2017 were as follows:
 
 
 
 
 
 
 
Gains and Losses on
Cash Flow Hedges
(Thousands of Dollars)
 
Three Months Ended March 31, 2018
 
Three Months Ended March 31, 2017
Accumulated other comprehensive loss at Jan. 1
 
$
(69
)
 
$
(133
)
Losses reclassified from net accumulated other comprehensive loss
 
23

 
19

Net current period other comprehensive income
 
23

 
19

Accumulated other comprehensive loss at March 31
 
$
(46
)
 
$
(114
)
 
 
 
 
 

Reclassifications from accumulated other comprehensive loss for the three months ended March 31, 2018 and 2017 were as follows:
 
 
 
 
 
 
 
 
Amounts Reclassified from
Accumulated Other
Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended March 31, 2018
 
Three Months Ended March 31, 2017
 
Losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
31

(a) 
$
31

(a) 
Total, pre-tax
 
31

 
31

 
Tax benefit
 
(8
)
 
(12
)
 
Total amounts reclassified, net of tax
 
$
23

 
$
19

 
 
 
 
 
 
 

(a) 
Included in interest charges.