Income Taxes - Reconciliations of Income Tax Rate and Actual Tax Charge (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net loss before taxes	$ (343,068)	$ (101,288)	$ (299,540)
Net loss not subject to taxes	(418,027)	(253,605)	(244,045)
Net income (loss) subject to taxes	74,959	152,317	(55,495)
At applicable statutory tax rates	11,741	28,437	(15,784)
Permanent differences	(3,846)	(23,179)	2,424
Adjustments related to currency differences	(360)	(338)	5,847
Valuation allowance and other	292	17,737	7,415
Tax expense (recovery) related to current year	$ 7,827	$ 22,657	$ (98)

Net loss income not subject to taxes.

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Net loss income subject to taxes.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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