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Financial instruments (Details 24) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning $ 105,988 $ 89,974
Allowance for expected credit losses at ending 81,294 105,988
Loans and receivables, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning 105,988 89,974
Transfer to lifetime expected credit losses - not credit-impaired 0 2
Transfer to lifetime expected credit losses - credit-impaired 0 0
Transfer to 12-month expected credit losses 0 (1)
Net effect of changes in reserve for expected credit losses 35,584 34,891
Financial assets that have been derecognized during the year (44,088) (82,396)
Changes due to financial instruments recognized as of December 31 (8,504) (47,504)
New financial assets originated or purchased 17,363 82,169
Write-offs (33,553) (18,807)
Recoveries of amounts previously written off 0 156
Allowance for expected credit losses at ending 81,294 105,988
Stage 1 [member] | Loans and receivables, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning [1] 29,036 59,214
Transfer to lifetime expected credit losses - not credit-impaired [1] (672) (9,117)
Transfer to lifetime expected credit losses - credit-impaired [1] 0 (7)
Transfer to 12-month expected credit losses [1] 1,428 2,038
Net effect of changes in reserve for expected credit losses [1] (2,900) (39,621)
Financial assets that have been derecognized during the year [1] (24,434) (65,640)
Changes due to financial instruments recognized as of December 31 [1] (26,578) (112,347)
New financial assets originated or purchased [1] 17,363 82,169
Write-offs [1] 0 0
Recoveries of amounts previously written off [1] 0 0
Allowance for expected credit losses at ending [1] 19,821 29,036
Stage 2 [member] | Loans and receivables, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning [2] 41,599 9,609
Transfer to lifetime expected credit losses - not credit-impaired [2] 672 9,119
Transfer to lifetime expected credit losses - credit-impaired [2] (12,845) (6,317)
Transfer to 12-month expected credit losses [2] (1,428) (2,077)
Net effect of changes in reserve for expected credit losses [2] 18,227 48,021
Financial assets that have been derecognized during the year [2] (11,321) (16,756)
Changes due to financial instruments recognized as of December 31 [2] (6,695) 31,990
New financial assets originated or purchased [2] 0 0
Write-offs [2] (1,427) 0
Recoveries of amounts previously written off [2] 0 0
Allowance for expected credit losses at ending [2] 33,477 41,599
Stage 3 [member] | Loans and receivables, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning [3] 35,353 21,151
Transfer to lifetime expected credit losses - not credit-impaired [3] 0 0
Transfer to lifetime expected credit losses - credit-impaired [3] 12,845 6,324
Transfer to 12-month expected credit losses [3] 0 38
Net effect of changes in reserve for expected credit losses [3] 20,257 26,491
Financial assets that have been derecognized during the year [3] (8,333) 0
Changes due to financial instruments recognized as of December 31 [3] 24,769 32,853
New financial assets originated or purchased [3] 0 0
Write-offs [3] (32,126) (18,807)
Recoveries of amounts previously written off [3] 0 156
Allowance for expected credit losses at ending [3] $ 27,996 $ 35,353
[1] 12-month expected credit losses.
[2] Lifetime expected credit losses.
[3] Credit-impaired financial assets (lifetime expected credit losses).