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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of commitments and contingent liabilities [Abstract]  
Disclosure of finance lease and operating lease by lessee [text block]
Future minimum lease payments under cancellable operating leases as follows:
  
 
 
December 31,
2017
 
December 31,
2016
 
December 31,
2015
 
Within 1 year
 
 
2,006
 
 
1,984
 
 
2,055
 
After 1 year but not more than 5 years
 
 
7,335
 
 
7,362
 
 
6,731
 
More than 5 years
 
 
8,814
 
 
10,638
 
 
14,128
 
Total
 
 
18,155
 
 
19,984
 
 
22,914
 
Disclosure of finance lease and operating lease by lessor [text block]
Future minimum lease payments under cancellable operating leases as follows:
 
 
 
December 31,
2017
 
December 31,
2016
 
December 31,
2015
 
Within 1 year
 
 
300
 
 
289
 
 
455
 
After 1 year but not more than 5 years
 
 
243
 
 
646
 
 
822
 
Total
 
 
543
 
 
935
 
 
1,277