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Retirement and Benefit Plans
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Retirement and Benefit Plans
Retirement and Benefit Plans
 
The following table presents the pension benefit costs:
 
 
Three Months Ended
March 31
 
2016
 
2015
 
(thousands)
Service cost
$
285

 
$
475

Interest cost
4,782

 
4,707

Expected return on plan assets
(5,103
)
 
(5,200
)
Amortization of actuarial loss
478

 
1,599

Plan settlement loss
297

 
501

Net periodic benefit expense
$
739

 
$
2,082


 
In the first three months of 2016, we contributed $2.3 million in cash to the pension plans. For the remainder of 2016, we expect to make approximately $1.5 million in additional cash contributions to the pension plans.