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III. Financial Risk Management - Proportions of Variable-rate and Fixed-rate Debt (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Significant borrowings as of closing date		$ 619,007	$ 822,152
Percentage		88.00%	96.00%
Fixed interest rate [member]
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Significant borrowings as of closing date	[1]	$ 237,320	$ 768,002
Percentage	[1]	38.00%	93.00%
Floating interest rate [member]
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Significant borrowings as of closing date		$ 381,687	$ 54,150
Percentage		62.00%	7.00%
[1] Out of the $237 million fixed rate borrowings, $197 million are short-term.

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

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