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Benefit Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
 
 
Three Months Ended June 30
 
 
2015
 
2014
 
2015
 
2014
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
1,190

 
$
1,132

 
$
7

 
$
8

Interest cost
 
1,630

 
1,814

 
163

 
197

Expected return on plan assets
 
(2,371
)
 
(2,410
)
 
(7
)
 
(13
)
Amortization of prior service cost (credit)
 
28

 
28

 
(88
)
 
(87
)
Amortization of net loss
 
1,701

 
1,654

 
114

 
166

Net benefit cost recognized for financial reporting
 
$
2,178

 
$
2,218

 
$
189

 
$
271


 
 
Six Months Ended June 30
 
 
2015
 
2014
 
2015
 
2014
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
2,380

 
$
2,264

 
$
14

 
$
17

Interest cost
 
3,260

 
3,628

 
326

 
395

Expected return on plan assets
 
(4,742
)
 
(4,821
)
 
(15
)
 
(26
)
Amortization of prior service cost (credit)
 
56

 
56

 
(176
)
 
(175
)
Amortization of net loss
 
3,402

 
3,308

 
228

 
333

Net benefit cost recognized for financial reporting
 
$
4,356

 
$
4,435

 
$
377

 
$
544