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Derivative instruments (Cash Flow Hedges Schedule Footnote) (Details) - Cash Flow Hedging - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ 356	$ 31,969	$ (59)
Cross-currency interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency exchange results	6,346	28,588	7,532
Net interest expense	(8,402)	(9,700)	(9,497)
Total	$ (2,056)	$ 18,888	$ (1,965)

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- Definition

The effective portion of loss (gain) reclassified from accumulated other comprehensive income to the statement of income within net interest expense.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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