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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (73,273)	$ 1,165,937	$ (20,923)
Effective income tax rate	26.50%	26.50%	26.50%
Expected income tax expense (benefit)	$ (19,417)	$ 308,973	$ (5,545)
Non-taxable income	(711)	(2,156)	14
Non-deductible share-based compensation	2,498	2,839	2,466
Non-deductible expenses	1,364	764	0
Non-deductible transaction costs	3,146	1,523	0
Effect of provincial tax rate difference	(15)	(44)	(64)
Effect of tax rates outside of Canada	(362)	70	0
Fair value gain on financial liabilities	(34,250)	(338,409)	0
Changes in valuation allowance	48,227	25,808	3,437
Other	867	632	(308)
Income tax expense (recovery), net	$ 1,347	$ 0	$ 0

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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