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Impairment of Inventory and Long-Lived Assets for Discontinued Operations (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of pre-tax impairment charges | The Company recorded impairment charges during the three months ended March 31, 2016 and June 30, 2015, as follows (in thousands):
| Three months ended
| March 31, 2016 |  | June 30, 2015
Drilling Technologies: |  |  |
Inventories | $ | 12,653 |  |  | $ | 17,241 |
Long-lived assets: |  |  |
Property and equipment | 14,642 |  |  | 2,327 |
Intangible assets other than goodwill | 9,227 |  |  | — |
Production Technologies: |  |  |
Inventories | 3,913 |  |  | 804 |
Total impairment | $ | 40,435 |  |  | $ | 20,372 |

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