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Derivative instruments (Fair Value Hedges) (Details) - Fair Value Hedging - Cross-currency swaps $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in Income on hedging derivatives	$ (9,599)
Gain recognized in Income on hedging items	4,118
Gain (loss) on fair value hedge ineffectiveness	$ (5,481)

X

- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
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+ References

No definition available.

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- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
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Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 25
-Section 50
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