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Benefit Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost (Credit)
Components of Net Periodic Benefit Cost (Credit)
 
 
Three Months Ended March 31
 
 
2014
 
2013
 
2014
 
2013
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
2,296

 
$
2,404

 
$
312

 
$
342

Interest cost
 
5,111

 
4,477

 
643

 
588

Expected return on plan assets
 
(6,545
)
 
(5,993
)
 
(812
)
 
(796
)
Amortization of prior service cost (credit)
 
14

 
218

 
(100
)
 
(121
)
Amortization of net loss (gain)
 
3,332

 
4,287

 
(80
)
 
(2
)
Net periodic benefit cost (credit)
 
4,208

 
5,393

 
(37
)
 
11

Credits (costs) not recognized due to the effects of regulation
 
707

 
(1,075
)
 
—

 
—

Net benefit cost (credit) recognized for financial reporting
 
$
4,915

 
$
4,318

 
$
(37
)
 
$
11