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Pension Plan (Tables)
3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of net benefit cost Net periodic pension cost consists of the following: 

Three Months Ended March 31,
 
2019
 
2018
Service cost
$
253

 
$
169


 
 


Interest cost on projected benefit obligation
782

 
701


 
 


Expected return on plan assets
(1,181
)
 
(1,354
)

 
 


Net amortization and deferral
720

 
672


 
 


Net periodic pension cost
$
574

 
$
188