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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2014
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Gain (Loss), Net of Tax
Changes in accumulated other comprehensive gain (loss), net of tax, for the three months ended March 31, 2014 and 2013 were as follows:
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 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 gain (loss) at Jan. 1
 
$
(59,753
)
 
$
77

 
$
(46,599
)
 
$
(106,275
)
Other comprehensive gain (loss) before reclassifications
 
(7
)
 
38

 
—

 
31

Losses reclassified from net accumulated other comprehensive loss
 
560

 
—

 
864

 
1,424

Net current period other comprehensive income
 
553

 
38

 
864

 
1,455

Accumulated other comprehensive gain (loss) at March 31
 
$
(59,200
)
 
$
115

 
$
(45,735
)
 
$
(104,820
)

 
 
Three Months Ended March 31, 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 gain (loss) before reclassifications
 
13

 
(36
)
 
—

 
(23
)
Gains reclassified from net accumulated other comprehensive loss
 
(305
)
 
—

 
(639
)
 
(944
)
Net current period other comprehensive loss
 
(292
)
 
(36
)
 
(639
)
 
(967
)
Accumulated other comprehensive loss at March 31
 
$
(61,533
)
 
$
(135
)
 
$
(51,952
)
 
$
(113,620
)
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications from accumulated other comprehensive loss for the three months ended March 31, 2014 and 2013 were as follows:
 
 
Amounts Reclassified from Accumulated 
Other Comprehensive Loss
 
(Thousands of Dollars)
 
Three Months Ended March 31, 2014
 
Three Months Ended March 31, 2013
 
(Gains) losses on cash flow hedges:
 
 
 
 
 
Interest rate derivatives
 
$
946

(a) 
$
1,150

(a) 
Vehicle fuel derivatives
 
(28
)
(b) 
(26
)
(b) 
Total, pre-tax
 
918

 
1,124

 
Tax benefit
 
(358
)
 
(1,429
)
 
Total, net of tax
 
560

 
(305
)
 
Defined benefit pension and postretirement (gains) losses:
 
 
 
 
 
Amortization of net loss
 
1,500

(c) 
1,769

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

(c) 
Transition obligation
 
—

(c) 
2

(c) 
Total, pre-tax
 
1,414

 
1,864

 
Tax benefit
 
(550
)
 
(2,503
)
 
Total, net of tax
 
864

 
(639
)
 
Total amounts reclassified, net of tax
 
$
1,424

 
$
(944
)
 
(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.