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The adjustment to expense when the entity obtains information that raises substantial doubt about the economic or operational viability of rig technologies.

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Represents the impairments and other charges incurred during the reporting period.

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The amount of severance and transaction-related costs.

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Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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Impairments and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Components of impairments and other charges
Goodwill impairments	$ 27,800			$ 27,798
Intangible asset impairment				83,624
Rig Technologies			$ 418	2,936
Oil and gas related assets				24,543
Severance and transaction related costs			6,228	19,070
Other assets			1,325	19,590
Total			66,731	410,631
U.S. Drilling
Components of impairments and other charges
Drilling	87,300			87,333
U.S. Drilling \| Lower 48
Components of impairments and other charges
Drilling	33,300
U.S. Drilling \| Alaska
Components of impairments and other charges
Drilling	54,000
Canada Drilling
Components of impairments and other charges
Drilling			58,545
International Drilling
Components of impairments and other charges
Drilling			$ 215	117,113
Write-downs and retirements				86,600
Impairment recognized				30,500
Drilling Solutions
Components of impairments and other charges
Goodwill impairments				11,400
Drilling		$ 28,600		28,624
Rig Technologies
Components of impairments and other charges
Goodwill impairments				$ 16,400
Drilling Solutions and Rig Technologies
Components of impairments and other charges
Impairment recognized	$ 83,600