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Pension Plan
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Pension Plan
Pension Plan

Net periodic pension cost consists of the following: 

Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
169

 
$
151

 
$
338

 
$
302


 
 


 
 
 


Interest cost on projected benefit obligation
701

 
693

 
1,403

 
1,387


 
 


 
 
 


Expected return on plan assets
(1,354
)
 
(1,325
)
 
(2,709
)
 
(2,650
)

 
 


 
 
 


Net amortization and deferral
672

 
794

 
1,344

 
1,587


 
 


 
 
 


Net periodic pension cost
$
188

 
$
313

 
$
376

 
$
626


 
We do not expect to make any pension contributions during 2018.