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Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Components of the net periodic benefit cost of the plan for the three months ended March 31, 2018 and 2017 were as follows (in thousands):
 
Three Months Ended
 
March 31,
2018
 
March 31,
2017
Interest cost
$

 
$
21

Expected return on plan assets

 
(9
)
Net periodic benefit cost
$

 
$
12