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Other Comprehensive Income
 3 Months Ended
Mar. 31, 2016
Stockholders' Equity Note [Abstract]  
Other Comprehensive Income
Other Comprehensive Income

Changes in accumulated other comprehensive loss, net of tax, for the three months ended March 31, 2016 and 2015 were as follows:
 
 
 
 
 

 
 
Three Months Ended March 31, 2016
(Thousands of Dollars)
 
Gains and Losses on Cash Flow Hedges
 
Defined Benefit and Postretirement Items
 
Total
Accumulated other comprehensive loss at Jan. 1
 
$
(23,836
)
 
$
—

 
$
(23,836
)
Other comprehensive loss before reclassifications
 
(2
)
 
(219
)
 
(221
)
Losses reclassified from net accumulated other comprehensive loss
 
264

 
—

 
264

Net current period other comprehensive income (loss)
 
262

 
(219
)
 
43

Accumulated other comprehensive loss at March 31
 
$
(23,574
)
 
$
(219
)
 
$
(23,793
)
 
 
 
 
 
 
 


 
 
Three Months Ended March 31, 2015
(Thousands of Dollars)
 
Gains and Losses on Cash Flow Hedges
Accumulated other comprehensive loss at Jan. 1
 
$
(23,878
)
Other comprehensive loss before reclassifications
 
(5
)
   Gains reclassified from net accumulated other comprehensive loss
 
(105
)
Net current period other comprehensive loss
 
(110
)
Accumulated other comprehensive loss at March 31
 
$
(23,988
)


Reclassifications from accumulated other comprehensive loss for the three months ended March 31, 2016 and 2015 were as follows:
 
 
 
 
 
 
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended March 31, 2016
 
Three Months Ended March 31, 2015
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
402

(a) 
$
(180
)
(a) 
Vehicle fuel derivatives
 
25

(b) 
11

(b) 
Total, pre-tax
 
427

 
(169
)
 
Tax (benefit) expense
 
(163
)
 
64

 
Total amounts reclassified, net of tax
 
$
264

 
$
(105
)
 
 
 
 
 
 
 
(a) 
Included in interest charges.
(b) 
Included in O&M expenses.