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Employee benefit plan (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension (Benefit) Cost
The following table presents the components of net periodic pension (benefit) cost for the three and six months ended June 30, 2018 and 2017 ($ in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
176

 
$
201

 
$
350

 
$
359

Interest cost
89

 
79

 
176

 
147

Effect of foreign exchange rates
(320
)
 
220

 
25

 
592

Amortization of prior service cost
(77
)
 
—

 
(52
)
 
—

Amortization of gain
(4
)
 
(7
)
 
(10
)
 
(15
)
Compensation-non-retirement post employment benefits
14

 
1

 
18

 
5

Settlement gain
—

 
—

 
—

 
(7
)
Net periodic pension (benefit) cost
$
(122
)
 
$
494

 
$
507

 
$
1,081