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Financial instruments (Details 21) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of financial instruments [Line Items] |  |  |
Financial assets | [1] | $ 488,003 | $ 403,035
91-120 days [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
91-120 days [member] | Corporations [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
91-120 days [member] | Banking and financial institutions [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
91-120 days [member] | Middle-market companies [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
121-150 days [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
121-150 days [member] | Corporations [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
121-150 days [member] | Banking and financial institutions [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
121-150 days [member] | Middle-market companies [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
151-180 days [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 4,000
151-180 days [member] | Corporations [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 4,000
151-180 days [member] | Banking and financial institutions [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
151-180 days [member] | Middle-market companies [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
Greater than 180 days [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 35,000 | 49,364
Greater than 180 days [member] | Corporations [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 14,364
Greater than 180 days [member] | Banking and financial institutions [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
Greater than 180 days [member] | Middle-market companies [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 35,000 | 35,000
Total past due [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 35,000 | 53,364
Total past due [member] | Corporations [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 18,364
Total past due [member] | Banking and financial institutions [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
Total past due [member] | Middle-market companies [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 35,000 | 35,000
Delinquent [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
Delinquent [member] | Corporations [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
Delinquent [member] | Banking and financial institutions [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
Delinquent [member] | Middle-market companies [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 0 | 0
Current [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 5,470,658 | 5,967,367
Current [member] | Corporations [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 2,606,113 | 3,424,446
Current [member] | Banking and financial institutions [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 2,657,444 | 2,283,876
Current [member] | Middle-market companies [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 207,101 | 259,045
Total [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 5,505,658 | 6,020,731
Total [Member] | Corporations [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 2,606,113 | 3,442,810
Total [Member] | Banking and financial institutions [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | 2,657,444 | 2,283,876
Total [Member] | Middle-market companies [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Financial assets |  | $ 242,101 | $ 294,045
[1] | Current ratings as of December 31, 2017 and 2016, respectively.

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35N&doctype=Standard -URIDate 2017-03-09 + Details
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