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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% |

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