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Derivative instruments (Fair Value Hedges) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in Income on hedging derivatives	$ (565)	$ (7,065)	$ (3,065)
Fair Value Hedging | Cross-Currency Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Loss recognized in Income on hedging derivatives		(9,599)	(5,814)
Gain recognized in Income on hedging items		4,118	2,877
Loss on fair value hedge ineffectiveness		$ 5,481	$ 2,937

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)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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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 recognized loss from the hedging ineffectiveness of a fair value hedge.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
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