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Significant accounting policies (Tables)
6 Months Ended
Jun. 30, 2019
Accounting Policies [Abstract]  
Operating lease payments
The Company's operating leases payments for the next five years and thereafter are as follows:
Year 1
 
Year 2
 
Year 3
 
Year 4
 
Year 5
 
Thereafter
 
Total
$
1,840

 
$
1,256

 
$
669

 
$
510

 
$
491

 
$
4,752

 
$
9,518