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Impairments and Other Charges (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Impairments and Other Charges    
Goodwill impairments   $ 27,798
Intangible asset impairment   83,624
Oil and gas related assets   12,286
Severance and transaction related costs $ 1,079 659
Other assets 986 16,603
Total 2,483 276,434
Other Machinery and Equipment    
Impairments and Other Charges    
Intangible asset impairment   28,600
U.S. Drilling    
Impairments and Other Charges    
Recorded impairment   33,300
U.S. Drilling | Drilling, workover rigs and related equipment    
Impairments and Other Charges    
Intangible asset impairment   82,372
Impairment wrote down   49,100
International Drilling | Drilling, workover rigs and related equipment    
Impairments and Other Charges    
Intangible asset impairment   30,485
Recorded impairment   30,500
Drilling Solutions    
Impairments and Other Charges    
Goodwill impairments   11,400
Rig Technologies    
Impairments and Other Charges    
Goodwill impairments   16,400
Intangible asset impairment 418 2,798
Provision for obsolescence $ 400 2,800
Rig Technologies | Other Machinery and Equipment    
Impairments and Other Charges    
Intangible asset impairment   $ 19,809