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Retirement and Benefit Plans
 3 Months Ended
Mar. 31, 2017
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
 
2017
 
2016
 
(thousands)
Service cost
$
301

 
$
285

Interest cost
4,376

 
4,782

Expected return on plan assets
(4,740
)
 
(5,103
)
Amortization of actuarial loss
395

 
478

Plan settlement loss
—

 
297

Net periodic benefit expense
$
332

 
$
739


 
During the three months ended March 31, 2017, we contributed $0.6 million in cash to the pension plans. For the remainder of 2017, we expect to make approximately $1.6 million in additional cash contributions to the pension plans.