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Employee benefit plan
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Employee benefit plan Employee benefit plan
In accordance with labor law regulations in Mexico, certain employees are legally entitled to receive severance that is commensurate with the tenure they had with us at the time of termination. There were no plan assets as of June 30, 2019 or December 31, 2018 as contributions are made only to the extent benefits are paid.
The following table presents the components of net periodic pension cost (benefit) for the three and six months ended June 30, 2019 and 2018 ($ in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
193

 
$
176

 
$
379

 
$
350

Interest cost
123

 
89

 
244

 
176

Effect of foreign exchange rates
200

 
(320
)
 
184

 
25

Amortization of prior service cost
1

 
(77
)
 
1

 
(52
)
Amortization of gain
(4
)
 
(4
)
 
(10
)
 
(10
)
Compensation-non-retirement post employment benefits
3

 
14

 
(73
)
 
18

Curtailment gain
(74
)
 
—

 
(171
)
 
—

Net periodic pension cost (benefit) 
$
442


$
(122
)
 
$
554

 
$
507



The service cost component of net periodic pension cost (benefit) is recorded within direct expense in the Condensed Consolidated Statements of Operations. The non-service cost components of net periodic pension cost (benefit) are recorded within other income (expense) for all periods presented.