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Employee benefit plan
 9 Months Ended
Sep. 30, 2017
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 without cause, which results in an unfunded benefit obligation. There were no plan assets as of September 30, 2017 or December 31, 2016 as contributions are made only to the extent benefits are paid.

The following table presents the components of net periodic benefit cost for the three and nine months ended September 30, 2017 and 2016 ($ in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
183

 
$
174

 
$
542

 
$
507

Interest cost
87

 
64

 
234

 
185

Effect of foreign exchange rates
(78
)
 
(125
)
 
514

 
(495
)
Amortization of prior service cost
—

 
—

 
—

 
2

Amortization of gain
(7
)
 
(2
)
 
(22
)
 
(8
)
Compensation-non-retirement post employment benefits
(41
)
 
24

 
(36
)
 
54

Settlement gain
(84
)
 
—

 
(91
)
 
—

Curtailment gain
(34
)
 
—

 
(34
)
 
(5
)
Net periodic benefit cost
$
26

 
$
135

 
$
1,107

 
$
240