Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the differences between taxes on income (loss) before income taxes
Taxes (benefit) on U.S. and other international earnings (losses) at greater than the Bermuda rate	$ 54,060	$ 49,375	$ (98,119)
Increase (decrease) in valuation allowance	32,869	38,822	29,165
Impact of Tax Reform Act			138,635
Tax reserves and interest	1,107	(10,626)	(148,615)
State income taxes (benefit)	3,540	1,698	(4,036)
Total income tax expense (benefit)	$ 91,576	$ 79,269	$ (82,970)
Effective tax rate (as a percent)	(15.50%)	(15.30%)	14.30%
Effective income tax rate	21.00%		35.00%
Tax benefit from release of valuation allowance	$ 29,600
Tax dispute settlement amount	$ 14,400
Canada Drilling
Reconciliation of the differences between taxes on income (loss) before income taxes
Valuation allowance		$ 52,000
Office of the Tax Commissioner, Bermuda
Reconciliation of the differences between taxes on income (loss) before income taxes
Effective income tax rate	0.00%

Amount of tax (expense) benefit attributable to release of valuation allowance.

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

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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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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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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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