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Other Comprehensive Income
 6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Other Comprehensive Income
Other Comprehensive Income

Changes in accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2013 were as follows:
 
 
Three Months Ended June 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 April 1
 
$
(61,533
)
 
$
(135
)
 
$
(51,952
)
 
$
(113,620
)
Other comprehensive loss before reclassifications
 
(44
)
 
—

 
—

 
(44
)
Losses reclassified from net accumulated other comprehensive loss
 
694

 
—

 
1,135

 
1,829

Net current period other comprehensive income
 
650

 
—

 
1,135

 
1,785

Accumulated other comprehensive loss at June 30
 
$
(60,883
)
 
$
(135
)
 
$
(50,817
)
 
$
(111,835
)
 
 
Six Months Ended June 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 before reclassifications
 
(31
)
 
(36
)
 
—

 
(67
)
Losses reclassified from net accumulated other comprehensive loss
 
389

 
—

 
496

 
885

Net current period other comprehensive income (loss)
 
358

 
(36
)
 
496

 
818

Accumulated other comprehensive loss at June 30
 
$
(60,883
)
 
$
(135
)
 
$
(50,817
)
 
$
(111,835
)


Reclassifications from accumulated other comprehensive loss for the three and six months ended June 30, 2013 were as follows:
 
 
Amounts Reclassified from
Accumulated Other
Comprehensive Loss
  
(Thousands of Dollars)
 
Three Months Ended June 30, 2013
 
Six Months Ended June 30, 2013
 
(Gains) losses on cash flow hedges:
 
 
 
 

  
Interest rate derivatives
 
$
1,162

(a) 
$
2,312

(a) 
Vehicle fuel derivatives
 
(17
)
(b) 
(42
)
(b) 
Total, pre-tax
 
1,145

  
2,270

  
Tax benefit
 
(451
)
  
(1,881
)
  
Total, net of tax
 
694

  
389

  
Defined benefit pension and postretirement losses:
 
 
  
 

  
Amortization of net loss
 
1,769

(c) 
3,538

(c) 
Prior service cost
 
93

(c) 
186

(c) 
Transition obligation
 
2

(c) 
4

(c) 
Total, pre-tax
 
1,864

 
3,728

  
Tax benefit
 
(729
)
 
(3,232
)
  
Total, net of tax
 
1,135

 
496

  
Total amounts reclassified, net of tax
 
$
1,829

 
$
885

  

(a) 
Included in interest charges.
(b) 
Included in O&M expenses.
(c) 
Included in the computation of net periodic pension and post retirement benefit costs.  See Note 12 for details regarding these benefit plans.