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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2016
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 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 out of Accumulated Other Comprehensive Loss
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.