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Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Components of the net periodic benefit cost of the plan for the three and nine months ended September 30, 2018 and 2017 were as follows (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2018
 
September 30,
2017
 
September 30,
2018
 
September 30,
2017
Interest cost
$

 
$
21

 

 
62

Expected return on plan assets

 
(9
)
 

 
(27
)
Net periodic benefit cost
$

 
$
12

 
$

 
$
35