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Income and other taxes - Reconciliation of Deferred Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of income tax [Abstract]
Beginning balance deferred tax liability (asset)	$ 54,085	$ 74,072
Deferred tax expense (income)	38,392	(20,170)
Amount charged to OCI	0	183
Net change in deferred taxes	38,392	(19,987)
Ending balance deferred tax liability (asset)	$ 92,477	$ 54,085

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- Definition

Disclosure of income tax [Abstract]

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No definition available.

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- Definition

Net Change In Deferred Taxes

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- Definition

The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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