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Basis for preparation, consolidation and accounting policies - Impact of Adoption of IFRIC 23 on consolidated statement of financial position (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Liabilities
Current tax liabilities, current	$ 5,650		$ 1,760
Total liabilities	1,139,074		1,187,656	$ 1,269,186
Shareholders' equity, net
Retained earnings	1,639,658		1,675,909
Total shareholders' equity, net	2,968,200		$ 3,029,565	$ 3,063,627	$ 3,047,213
IFRIC 23 [Member]
Liabilities
Current tax liabilities, current	382	$ 382
Total liabilities	382	382
Shareholders' equity, net
Retained earnings	(382)	(382)
Total shareholders' equity, net	$ (382)	$ (382)

The amount of residual interest in the assets of the entity after deducting all its liabilities.

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- Definition

Expiry date 2020-01-01: The amount of present obligations of the entity arising from past events, the settlement of which is expected to result in an outflow from the entity of resources embodying economic benefits. Effective 2020-01-01: The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

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