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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 |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2443-110228 + Details
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