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Employee Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The following table presents the components of Net periodic benefit cost for the periods presented (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
Service cost - benefits earning during the period
 
$

 
$

 
$

 
$

Interest cost on projected benefit obligation
 
1,344

 
1,403

 
4,033

 
4,209

Expected return on assets
 
(1,901
)
 
(1,921
)
 
(5,702
)
 
(5,764
)
Actuarial gain
 

 

 

 

Foreign currency gain (loss)
 
(24
)
 
7

 
(72
)
 
22

Net periodic benefit cost (income)
 
$
(581
)
 
$
(511
)
 
$
(1,741
)
 
$
(1,533
)