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Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2014
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax
Changes in accumulated other comprehensive income (loss), net of tax, for the three and nine months ended Sept. 30, 2014 and 2013 were as follows:
 
 
Three Months Ended Sept. 30, 2014
(Thousands of Dollars)
 
Gains and Losses
on Cash Flow Hedges
 
Unrealized Gains and Losses
on Marketable Securities
 
Defined Benefit Pension and
Postretirement Items
 
Total
Accumulated other comprehensive (loss) income at July 1
 
$
(58,610
)
 
$
115

 
$
(44,871
)
 
$
(103,366
)
Other comprehensive (loss) income before reclassifications
 
(42
)
 
2

 
—

 
(40
)
Losses reclassified from net accumulated other comprehensive loss
 
558

 
—

 
847

 
1,405

Net current period other comprehensive income
 
516

 
2

 
847

 
1,365

Accumulated other comprehensive (loss) income at Sept. 30
 
$
(58,094
)
 
$
117

 
$
(44,024
)
 
$
(102,001
)
 
 
Three Months Ended Sept. 30, 2013
(Thousands of Dollars)
 
Gains and Losses
on Cash Flow Hedges
 
Unrealized Gains and Losses
on Marketable Securities
 
Defined Benefit Pension and
Postretirement Items
 
Total
Accumulated other comprehensive loss at July 1
 
$
(60,883
)
 
$
(135
)
 
$
(50,817
)
 
$
(111,835
)
Other comprehensive income before reclassifications
 
22

 
115

 
—

 
137

Losses reclassified from net accumulated other comprehensive loss
 
539

 
—

 
1,179

 
1,718

Net current period other comprehensive income
 
561

 
115

 
1,179

 
1,855

Accumulated other comprehensive loss at Sept. 30
 
$
(60,322
)
 
$
(20
)
 
$
(49,638
)
 
$
(109,980
)
 
 
Nine Months Ended Sept. 30, 2014
(Thousands of Dollars)
 
Gains and Losses
on Cash Flow Hedges
 
Unrealized Gains and Losses
on Marketable Securities
 
Defined Benefit Pension and
Postretirement Items
 
Total
Accumulated other comprehensive (loss) income at Jan. 1
 
$
(59,753
)
 
$
77

 
$
(46,599
)
 
$
(106,275
)
Other comprehensive (loss) income before reclassifications
 
(34
)
 
40

 
—

 
6

Losses reclassified from net accumulated other comprehensive loss
 
1,693

 
—

 
2,575

 
4,268

Net current period other comprehensive income
 
1,659

 
40

 
2,575

 
4,274

Accumulated other comprehensive (loss) income at Sept. 30
 
$
(58,094
)
 
$
117

 
$
(44,024
)
 
$
(102,001
)

 
 
Nine Months Ended Sept. 30, 2013
(Thousands of Dollars)
 
Gains and Losses
on Cash Flow Hedges
 
Unrealized Gains and Losses
on Marketable Securities
 
Defined Benefit Pension and
Postretirement Items
 
Total
Accumulated other comprehensive loss at Jan. 1
 
$
(61,241
)
 
$
(99
)
 
$
(51,313
)
 
$
(112,653
)
Other comprehensive (loss) income before reclassifications
 
(9
)
 
79

 
—

 
70

Losses reclassified from net accumulated other comprehensive loss
 
928

 
—

 
1,675

 
2,603

Net current period other comprehensive income
 
919

 
79

 
1,675

 
2,673

Accumulated other comprehensive loss at Sept. 30
 
$
(60,322
)
 
$
(20
)
 
$
(49,638
)
 
$
(109,980
)
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the three and nine months ended Sept. 30, 2014 and 2013 were as follows:
 
 
Amounts Reclassified from Accumulated 
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended Sept. 30, 2014
 
Three Months Ended Sept. 30, 2013
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
967

(a) 
$
829

(a) 
Vehicle fuel derivatives
 
(16
)
(b) 
(24
)
(b) 
Total, pre-tax
 
951

 
805

 
Tax benefit
 
(393
)
 
(266
)
 
Total, net of tax
 
558

 
539

 
Defined benefit pension and postretirement (gains) losses:
 
 
 
 
 
Amortization of net loss
 
1,500

(c) 
1,770

(c) 
Prior service (credit) cost
 
(86
)
(c) 
93

(c) 
Transition obligation
 
—

(c) 
2

(c) 
Total, pre-tax
 
1,414

 
1,865

 
Tax benefit
 
(567
)
 
(686
)
 
Total, net of tax
 
847

 
1,179

 
Total amounts reclassified, net of tax
 
$
1,405

 
$
1,718

 
 
 
Amounts Reclassified from Accumulated 
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Nine Months Ended Sept. 30, 2014
 
Nine Months Ended Sept. 30, 2013
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
2,869

(a) 
$
3,140

(a) 
Vehicle fuel derivatives
 
(61
)
(b) 
(67
)
(b) 
Total, pre-tax
 
2,808

 
3,073

 
Tax benefit
 
(1,115
)
 
(2,145
)
 
Total, net of tax
 
1,693

 
928

 
Defined benefit pension and postretirement (gains) losses:
 
 
 
 
 
Amortization of net loss
 
4,499

(c) 
5,308

(c) 
Prior service (credit) cost
 
(258
)
(c) 
279

(c) 
Transition obligation
 
—

(c) 
6

(c) 
Total, pre-tax
 
4,241

 
5,593

 
Tax benefit
 
(1,666
)
 
(3,918
)
 
Total, net of tax
 
2,575

 
1,675

 
Total amounts reclassified, net of tax
 
$
4,268

 
$
2,603

 
(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 12 for details regarding these benefit plans.