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Pension Plan
 6 Months Ended
Jun. 30, 2019
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,
 
2019
 
2018
2019
 
2018
Service cost
$
253

 
$
169

$
506

 
$
338


 
 


 
 


Interest cost on projected benefit obligation
782

 
701

1,564

 
1,403


 
 


 
 


Expected return on plan assets
(1,181
)
 
(1,354
)
(2,362
)
 
(2,709
)

 
 


 
 


Net amortization and deferral
720

 
672

1,440

 
1,344


 
 


 
 


Net periodic pension cost
$
574

 
$
188

$
1,148

 
$
376


 
We do not expect to make any pension contributions during 2019. Non-service cost of $0.3 million and $0.6 million are included in other expense in the consolidated condensed statement of comprehensive income for the three and six months ended June 30, 2019, respectively.