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Other Comprehensive Income
 9 Months Ended
Sep. 30, 2016
Stockholders' Equity Note [Abstract]  
Other Comprehensive Income
Other Comprehensive Income

Changes in accumulated other comprehensive loss, net of tax, for the three and nine months ended Sept. 30, 2016 and 2015 were as follows:

 
 
Three Months Ended Sept. 30, 2016
(Thousands of Dollars)
 
Gains and Losses on Cash Flow Hedges
 
Defined Benefit and Postretirement Items
 
Total
Accumulated other comprehensive loss at July 1
 
$
(23,308
)
 
$
(217
)
 
$
(23,525
)
Other comprehensive loss before reclassifications
 
(1
)
 
—

 
(1
)
Losses reclassified from net accumulated other comprehensive loss
 
266

 
—

 
266

Net current period other comprehensive income
 
265

 
—

 
265

Accumulated other comprehensive loss at Sept. 30
 
$
(23,043
)
 
$
(217
)
 
$
(23,260
)
 
 
Three Months Ended Sept. 30, 2015
(Thousands of Dollars)
 
Gains and Losses on
Cash Flow Hedges
Accumulated other comprehensive loss at July 1
 
$
(24,086
)
Other comprehensive loss before reclassifications
 
(17
)
Losses reclassified from net accumulated other comprehensive loss
 
19

Net current period other comprehensive income
 
2

Accumulated other comprehensive loss at Sept. 30
 
$
(24,084
)

 
 
Nine Months Ended Sept. 30, 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 income (loss) before reclassifications
 
1

 
(219
)
 
(218
)
Losses reclassified from net accumulated other comprehensive loss
 
792

 
2

 
794

Net current period other comprehensive income (loss)
 
793

 
(217
)
 
576

Accumulated other comprehensive loss at Sept. 30
 
$
(23,043
)
 
$
(217
)
 
$
(23,260
)

 
 
Nine Months Ended Sept. 30, 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
 
(14
)
Gains reclassified from net accumulated other comprehensive loss
 
(192
)
Net current period other comprehensive loss
 
(206
)
Accumulated other comprehensive loss at Sept. 30
 
$
(24,084
)


Reclassifications from accumulated other comprehensive loss for the three and nine months ended Sept. 30, 2016 and 2015 were as follows:
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended Sept. 30, 2016
 
Three Months Ended Sept. 30, 2015
 
Losses (gains) on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
407

(a) 
$
9

(a) 
Vehicle fuel derivatives
 
21

(b) 
15

(b) 
Total, pre-tax
 
428

 
24

 
Tax benefit
 
(162
)
 
(5
)
 
Total amounts reclassified, net of tax
 
$
266

 
$
19

 
 
 
Amounts Reclassified from Accumulated
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Nine Months Ended Sept. 30, 2016
 
Nine Months Ended Sept. 30, 2015
 
Losses (gains) on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
1,211

(a) 
$
(353
)
(a) 
Vehicle fuel derivatives
 
67

(b) 
38

(b) 
Total, pre-tax
 
1,278

 
(315
)
 
Tax (benefit) expense
 
(486
)
 
123

 
Total amounts reclassified, net of tax
 
$
792

 
$
(192
)
 
(a) 
Included in interest charges.
(b) 
Included in O&M expenses.