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Financial instruments (Details 7) - 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
Financial assets at fair value through other comprehensive income, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning 305 7,149
Transfer to lifetime expected credit losses 0 425
Transfer to credit-impaired financial assets 0 0
Transfer to 12-month expected credit losses 0 0
Net effect of changes in reserve for expected credit losses (71) (183)
Financial assets that have been derecognized during the year (12) (377)
Changes due to financial instruments recognized as of December 31 (83) (135)
New financial assets originated or purchased 0 28
Write-offs 0 (6,737)
Allowance for expected credit losses at ending 222 305
Loans and receivables, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning 105,988 89,974
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 4,067,723 4,064,325
Allowance for expected credit losses at ending 81,294 105,988
Stage 1 [member] | Financial assets at fair value through other comprehensive income, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning [1] 42 234
Transfer to lifetime expected credit losses [1] 0 (31)
Transfer to credit-impaired financial assets [1] 0 0
Transfer to 12-month expected credit losses [1] 0 0
Net effect of changes in reserve for expected credit losses [1] (6) (15)
Financial assets that have been derecognized during the year [1] (12) (174)
Changes due to financial instruments recognized as of December 31 [1] (18) (220)
New financial assets originated or purchased [1] 0 28
Write-offs [1] 0 0
Allowance for expected credit losses at ending [1] 24 42
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 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 4,067,723 4,064,325
Allowance for expected credit losses at ending [1] 19,821 29,036
Stage 2 [member] | Financial assets at fair value through other comprehensive income, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning [2] 263 178
Transfer to lifetime expected credit losses [2] 0 456
Transfer to credit-impaired financial assets [2] 0 0
Transfer to 12-month expected credit losses [2] 0 0
Net effect of changes in reserve for expected credit losses [2] (65) (168)
Financial assets that have been derecognized during the year [2] 0 (203)
Changes due to financial instruments recognized as of December 31 [2] (65) 85
New financial assets originated or purchased [2] 0 0
Write-offs [2] 0 0
Allowance for expected credit losses at ending [2] 198 263
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 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 0 0
Allowance for expected credit losses at ending [2] 33,477 41,599
Stage 3 [member] | Financial assets at fair value through other comprehensive income, category [member]    
Disclosure of financial instruments [Line Items]    
Allowance for expected credit losses at beginning [3] 0 6,737
Transfer to lifetime expected credit losses [3] 0 0
Transfer to credit-impaired financial assets [3] 0 0
Transfer to 12-month expected credit losses [3] 0 0
Net effect of changes in reserve for expected credit losses [3] 0 0
Financial assets that have been derecognized during the year [3] 0 0
Changes due to financial instruments recognized as of December 31 [3] 0 0
New financial assets originated or purchased [3] 0 0
Write-offs [3] 0 (6,737)
Allowance for expected credit losses at ending [3] 0 0
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 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 0 0
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).