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Benefit Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
 
 
Three Months Ended Sept. 30
 
 
2013
 
2012
 
2013
 
2012
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
2,404

 
$
2,130

 
$
342

 
$
314

Interest cost
 
4,477

 
4,900

 
588

 
707

Expected return on plan assets
 
(5,993
)
 
(6,232
)
 
(796
)
 
(675
)
Amortization of transition obligation
 
—

 
—

 
—

 
386

Amortization of prior service cost (credit)
 
218

 
360

 
(121
)
 
(37
)
Amortization of net loss (gain)
 
4,287

 
3,203

 
(2
)
 
314

Net periodic benefit cost
 
5,393

 
4,361

 
11

 
1,009

Credits (costs) not recognized due to the effects of
regulation
 
62

 
(1,076
)
 
—

 
—

Net benefit cost recognized for financial reporting
 
$
5,455

 
$
3,285

 
$
11

 
$
1,009


 
 
Nine Months Ended Sept. 30
 
 
2013
 
2012
 
2013
 
2012
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
7,211

 
$
6,390

 
$
1,026

 
$
944

Interest cost
 
13,431

 
14,700

 
1,764

 
2,123

Expected return on plan assets
 
(17,978
)
 
(18,696
)
 
(2,388
)
 
(2,026
)
Amortization of transition obligation
 
—

 
—

 
—

 
1,159

Amortization of prior service cost (credit)
 
653

 
1,079

 
(363
)
 
(111
)
Amortization of net loss (gain)
 
12,861

 
9,610

 
(5
)
 
942

Net periodic benefit cost
 
16,178

 
13,083

 
34

 
3,031

Costs not recognized due to the effects of regulation
 
(1,330
)
 
(3,226
)
 
—

 
—

Net benefit cost recognized for financial reporting
 
$
14,848

 
$
9,857

 
$
34

 
$
3,031