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Benefit Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost (Credit)
Components of Net Periodic Benefit Cost (Credit)
 
 
Three Months Ended June 30
 
 
2014
 
2013
 
2014
 
2013
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
5,985

 
$
6,301

 
$
478

 
$
803

Interest cost
 
13,319

 
11,540

 
5,926

 
5,934

Expected return on plan assets
 
(17,677
)
 
(15,955
)
 
(7,553
)
 
(7,307
)
Amortization of transition obligation
 
—

 
—

 
—

 
196

Amortization of prior service credit
 
(773
)
 
(266
)
 
(1,561
)
 
(1,229
)
Amortization of net loss
 
8,473

 
10,854

 
1,608

 
3,489

Net benefit cost (credit) recognized for financial reporting
 
$
9,327

 
$
12,474

 
$
(1,102
)
 
$
1,886


 
 
Six Months Ended June 30
 
 
2014
 
2013
 
2014
 
2013
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
11,970

 
$
12,603

 
$
957

 
$
1,606

Interest cost
 
26,638

 
23,080

 
11,852

 
11,868

Expected return on plan assets
 
(35,354
)
 
(31,910
)
 
(15,107
)
 
(14,614
)
Amortization of transition obligation
 
—

 
—

 
—

 
392

Amortization of prior service credit
 
(1,546
)
 
(532
)
 
(3,123
)
 
(2,458
)
Amortization of net loss
 
16,946

 
21,708

 
3,217

 
6,979

Net benefit cost (credit) recognized for financial reporting
 
$
18,654

 
$
24,949

 
$
(2,204
)
 
$
3,773