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Income taxes - Summary of Change in Net Deferred Tax Position (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net deferred tax asset (liability)
Beginning balance	$ 429,929	$ 549,127
Deferred income tax recovery in the statement of operations	16,579	118,839
Deferred tax recovery in consolidated statement of OCI	(633)	(359)
Ending balance	$ 412,717	$ 429,929

X

- Definition

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

+ References

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X

- Definition

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

+ References

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X

- Definition

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

+ References

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- References

No definition available.

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