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Intangible assets and goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Intangible Assets And Goodwill [Abstract]
Intangible assets other than goodwill	$ 188,283		$ 113,787	$ 109,439
Goodwill	34,718	$ 37,972	37,972	37,972
Total	$ 223,001		$ 151,759	$ 147,411	$ 148,816

X

- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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X

- Definition

The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill]

+ References

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- Definition

The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]

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