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Benefit Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
 
 
Three Months Ended June 30
 
 
2013
 
2012
 
2013
 
2012
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
6,301

 
$
5,863

 
$
803

 
$
590

Interest cost
 
11,540

 
12,929

 
5,934

 
6,122

Expected return on plan assets
 
(15,955
)
 
(16,416
)
 
(7,307
)
 
(6,258
)
Amortization of transition obligation
 
—

 
—

 
196

 
2,751

Amortization of prior service (credit) cost
 
(266
)
 
57

 
(1,229
)
 
(1,287
)
Amortization of net loss
 
10,854

 
8,795

 
3,489

 
2,860

Net periodic benefit cost
 
12,474

 
11,228

 
1,886

 
4,778

Additional cost recognized due to the effects of regulation
 
—

 
—

 
—

 
973

Net benefit cost recognized for financial reporting
 
$
12,474

 
$
11,228

 
$
1,886

 
$
5,751

 
 
Six Months Ended June 30
 
 
2013
 
2012
 
2013
 
2012
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
12,603

 
$
11,360

 
$
1,606

 
$
1,413

Interest cost
 
23,080

 
25,553

 
11,868

 
12,264

Expected return on plan assets
 
(31,910
)
 
(32,651
)
 
(14,614
)
 
(12,528
)
Amortization of transition obligation
 
—

 
—

 
392

 
5,502

Amortization of prior service (credit) cost
 
(532
)
 
114

 
(2,458
)
 
(2,575
)
Amortization of net loss
 
21,708

 
17,100

 
6,979

 
5,464

Net periodic benefit cost
 
24,949

 
21,476

 
3,773

 
9,540

Additional cost recognized due to the effects of regulation
 
—

 
—

 
—

 
1,946

Net benefit cost recognized for financial reporting
 
$
24,949

 
$
21,476

 
$
3,773

 
$
11,486