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Other Comprehensive Income
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016 were as follows:

 
 
Three Months Ended March 31, 2017
(Thousands of Dollars)
 
Gains and Losses on Cash Flow Hedges
 
Defined Benefit and Postretirement Items
 
Total
Accumulated other comprehensive loss at Jan. 1
 
$
(22,780
)
 
$
(220
)
 
$
(23,000
)
Losses reclassified from net accumulated other comprehensive loss
 
246

 
1

 
247

Net current period other comprehensive income
 
246

 
1

 
247

Accumulated other comprehensive loss at March 31
 
$
(22,534
)
 
$
(219
)
 
$
(22,753
)

 
 
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 loss
 
262

 
(219
)
 
43

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


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
 
$
398

(a) 
$
402

(a) 
Vehicle fuel derivatives
 
—

(b) 
25

(b) 
Total, pre-tax
 
398

 
427

 
Tax benefit
 
(152
)
 
(163
)
 
Total, net of tax
 
$
246

 
$
264

 
Defined benefit pension and postretirement losses:
 
 
 
 
 
Amortization of net loss
 
$
2

(c) 
$
—

 
Total, pre-tax
 
2

 
—

 
Tax benefit
 
(1
)
 
—

 
Total, net of tax
 
1

 
—

 
Total amounts reclassified, net of tax
 
$
247

 
$
264

 
(a) 
Included in interest charges.
(b) 
Included in O&M expenses.
(c) 
Included in the computation of net periodic pension and postretirement benefit costs. See Note 11 for details regarding these benefit plans.