Pension obligations (Narrative) (Details) - Pension obligations [Member] $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)	Dec. 31, 2016
Statement [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	$ 19,401
Weighted average duration of defined benefit obligation	15.8	15.7
Return on plan assets, percentage	11.50%	5.01%
Active members [Member]
Statement [Line Items]
Weighted average duration of defined benefit obligation	18.4	17.1
Deferred members [Member]
Statement [Line Items]
Weighted average duration of defined benefit obligation	26.9	23.5
Retired members [Member]
Statement [Line Items]
Weighted average duration of defined benefit obligation	10.2	12.4
Actuarial assumption of discount rates [Member]
Statement [Line Items]
Reasonably possible increase in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 27,622
Reasonably possible decrease in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 31,183
Actuarial assumption of expected rates of salary increases [Member]
Statement [Line Items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 3,893
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 3,533
Actuarial assumptions of life expectancy [Member]
Statement [Line Items]
Reasonably possible increase in life expectancy (years)	1
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 5,804
Reasonably possible decrease in life expectancy (years)	1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 5,903

Reasonably possible decrease in actuarial assumption, basis points

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Reasonably possible decrease in life expectancy (years)

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Reasonably possible increase in actuarial assumption, basis points

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Reasonably possible increase in life expectancy (years)

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Return on plan assets, percentage

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Statement [Line Items]

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The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 147
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2017-01-01
-Paragraph 148
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard
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The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2017-01-01
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