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Pension Plan
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Pension Plan
Pension Plan

Net periodic pension cost consists of the following: 

Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
169

 
$
151

 
$
506

 
$
452


 
 


 
 
 


Interest cost on projected benefit obligation
701

 
693

 
2,104

 
2,080


 
 


 
 
 


Expected return on plan assets
(1,354
)
 
(1,325
)
 
(4,063
)
 
(3,975
)

 
 


 
 
 


Net amortization and deferral
672

 
794

 
2,017

 
2,381


 
 


 
 
 


Net periodic pension cost
$
188

 
$
313

 
$
564

 
$
938


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