XML 64 R27.htm IDEA: XBRL DOCUMENT v2.4.0.8
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
 
$
2,296

 
$
2,403

 
$
311

 
$
342

Interest cost
 
5,111

 
4,477

 
643

 
588

Expected return on plan assets
 
(6,545
)
 
(5,992
)
 
(811
)
 
(796
)
Amortization of prior service cost (credit)
 
13

 
217

 
(101
)
 
(121
)
Amortization of net loss (gain)
 
3,331

 
4,287

 
(81
)
 
(1
)
Net periodic benefit cost (credit)
 
4,206

 
5,392

 
(39
)
 
12

Credits (costs) not recognized due to the effects of regulation
 
708

 
(317
)
 
—

 
—

Net benefit cost (credit) recognized for financial reporting
 
$
4,914

 
$
5,075

 
$
(39
)
 
$
12


 
 
Six Months Ended June 30
 
 
2014
 
2013
 
2014
 
2013
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
4,592

 
$
4,807

 
$
623

 
$
684

Interest cost
 
10,222

 
8,954

 
1,286

 
1,176

Expected return on plan assets
 
(13,090
)
 
(11,985
)
 
(1,623
)
 
(1,592
)
Amortization of prior service cost (credit)
 
27

 
435

 
(201
)
 
(242
)
Amortization of net loss (gain)
 
6,663

 
8,574

 
(161
)
 
(3
)
Net periodic benefit cost (credit)
 
8,414

 
10,785

 
(76
)
 
23

Credits (costs) not recognized due to the effects of regulation
 
1,415

 
(1,392
)
 
—

 
—

Net benefit cost (credit) recognized for financial reporting
 
$
9,829

 
$
9,393

 
$
(76
)
 
$
23