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Retirement and Benefit Plans
 6 Months Ended
Jun. 30, 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
June 30
 
Six Months Ended
June 30
 
2016
 
2015
 
2016
 
2015
 
(thousands)
Service cost
$
282

 
$
239

 
$
567

 
$
714

Interest cost
4,789

 
4,744

 
9,571

 
9,451

Expected return on plan assets
(5,076
)
 
(5,495
)
 
(10,179
)
 
(10,695
)
Amortization of actuarial loss
478

 
1,311

 
956

 
2,910

Plan settlement loss
—

 
—

 
297

 
501

Net periodic benefit expense
$
473

 
$
799

 
$
1,212

 
$
2,881


 
In the first six months of 2016, we contributed $2.8 million in cash to the pension plans. For the remainder of 2016, we expect to make approximately $1.0 million in additional cash contributions to the pension plans.