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Retirement and Benefit Plans
 6 Months Ended
Jun. 30, 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
June 30
 
Six Months Ended
June 30
 
2017
 
2016
 
2017
 
2016
 
(thousands)
Service cost
$
301

 
$
282

 
$
602

 
$
567

Interest cost
4,382

 
4,789

 
8,758

 
9,571

Expected return on plan assets
(4,742
)
 
(5,076
)
 
(9,482
)
 
(10,179
)
Amortization of actuarial loss
410

 
478

 
805

 
956

Plan settlement loss
—

 
—

 
—

 
297

Net periodic benefit expense
$
351

 
$
473

 
$
683

 
$
1,212


 
During the six months ended June 30, 2017, we contributed $1.1 million in cash to the pension plans. For the remainder of 2017, we expect to make approximately $1.0 million in additional cash contributions to the pension plans.