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Details of Selected Balance Sheet Accounts - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Concentration Risk [Line Items]          
Decrease in contract with customer, asset       $ (13,400)  
Contract with customer, asset, reclassified to receivable       (34,600)  
Contract with customer, asset, increase due to revenue recognized       21,100  
Decrease deferred revenue       (872) $ 31,114
Contract with customer, liability, revenue recognized       (6,100)  
Contract with customer, liability, increase due to billings       5,300  
Impairments of inventories $ 2,113 $ 5,921 $ 25,230 2,113 31,151
Depreciation 14,700 18,000   46,700 56,600
Amortization 4,900 6,200   15,400 18,700
Downhole Technologies          
Concentration Risk [Line Items]          
Impairments of inventories $ 2,100 $ 5,900   $ 2,100 $ 5,900
UNITED STATES | Geographic Concentration Risk | Accounts Receivable          
Concentration Risk [Line Items]          
Concentration risk, percentage       77.00%  
UNITED KINGDOM | Geographic Concentration Risk | Accounts Receivable          
Concentration Risk [Line Items]          
Concentration risk, percentage       12.00%