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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).

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