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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
Components of Net Periodic Benefit Cost
 
 
Three Months Ended June 30
 
 
2014
 
2013
 
2014
 
2013
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
22,085

 
$
24,070

 
$
864

 
$
1,182

Interest cost
 
39,155

 
35,173

 
8,507

 
8,417

Expected return on plan assets
 
(51,801
)
 
(49,613
)
 
(8,488
)
 
(8,253
)
Amortization of transition obligation
 
—

 
—

 
—

 
206

Amortization of prior service (credit) cost
 
(436
)
 
1,468

 
(2,672
)
 
(2,438
)
Amortization of net loss
 
29,190

 
36,038

 
2,935

 
5,646

Net periodic benefit cost
 
38,193

 
47,136

 
1,146

 
4,760

Costs not recognized due to the effects of regulation
 
(6,604
)
 
(7,089
)
 
—

 
—

Net benefit cost recognized for financial reporting
 
$
31,589

 
$
40,047

 
$
1,146

 
$
4,760


 
 
Six Months Ended June 30
 
 
2014
 
2013
 
2014
 
2013
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
44,171

 
$
48,141

 
$
1,728

 
$
2,364

Interest cost
 
78,310

 
70,345

 
17,014

 
16,834

Expected return on plan assets
 
(103,602
)
 
(99,226
)
 
(16,977
)
 
(16,506
)
Amortization of transition obligation
 
—

 
—

 
—

 
412

Amortization of prior service (credit) cost
 
(873
)
 
2,936

 
(5,344
)
 
(4,876
)
Amortization of net loss
 
58,381

 
72,076

 
5,870

 
11,292

Net periodic benefit cost
 
76,387

 
94,272

 
2,291

 
9,520

Costs not recognized due to the effects of regulation
 
(13,656
)
 
(14,936
)
 
—

 
—

Net benefit cost recognized for financial reporting
 
$
62,731

 
$
79,336

 
$
2,291

 
$
9,520