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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Employee Benefit Plans [Abstract]  
Net Periodic Pension Benefit
The components of net periodic pension benefit for the three and six months ended June 30, 2018 and 2017 are recorded in other income (expense), net in the consolidated statements of operations and consisted of the following:

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Interest cost
$
(32
)
 
$
(34
)
 
$
(64
)
 
$
(68
)
Expected return on plan assets
52

 
47

 
104

 
94

Net periodic pension benefit
$
20

 
$
13

 
$
40

 
$
26