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Retirement and Benefit Plans
 3 Months Ended
Mar. 31, 2013
Retirement and Benefit Plans [Abstract]  
Retirement and Benefit Plans
Retirement and Benefit Plans
 
The following table presents the pension benefit costs:
 
 
Three Months Ended March 31
 
2013
 
2012
 
(thousands)
Service cost
$
671

 
$
1,169

Interest cost
4,642

 
4,843

Expected return on plan assets
(4,866
)
 
(4,844
)
Amortization of actuarial loss
2,256

 
2,026

Amortization of prior service costs
23

 
41

Net periodic benefit cost
$
2,726

 
$
3,235


 
In the first three months of 2013, we contributed $9.7 million in cash to the pension plans. For the remainder of 2013, we expect to make approximately $1 million in additional contributions to the pension plans.