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Discontinued Operations (Summary Of Financial Information That Has Been Segregated From Continuing Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Net loss from discontinued operations | $ (722) | $ 319 | $ (2,704) | $ (11,235) | $ (17,836) | $ (876) | $ (2,169) | $ (30,156) | $ (14,342) | $ (51,037) | $ (20,620)
Assets: |  |  |  |  |  |  |  |  |  |  |
Assets held for sale | 0 |  |  |  | 43,900 |  |  |  | 0 | 43,900 |
Discontinued Operations, Held-for-sale | Drilling Technologies |  |  |  |  |  |  |  |  |  |  |
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 11,534 | 27,627 | 52,112
Cost of revenue |  |  |  |  |  |  |  |  | (7,309) | (18,667) | (35,410)
Selling, general and administrative |  |  |  |  |  |  |  |  | (6,963) | (15,285) | (21,049)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | (1,714) | (3,240)
Research and development |  |  |  |  |  |  |  |  | (5) | (64) | (202)
Gain (loss) on disposal of long-lived assets |  |  |  |  |  |  |  |  | 97 | 103 | 17
Impairment of inventory and long-lived assets |  |  |  |  |  |  |  |  | 0 | (36,522) | (19,568)
Loss from operations |  |  |  |  |  |  |  |  | (2,646) | (44,522) | (27,340)
Other expense |  |  |  |  |  |  |  |  | (96) | (412) | (259)
Loss on sale of businesses |  |  |  |  |  |  |  |  | (1,600) | (1,199) | 0
Loss on write-down of assets held for sale |  |  |  |  |  |  |  |  | (6,831) | (18,971) | 0
Loss before income taxes |  |  |  |  |  |  |  |  | (11,173) | (65,104) | (27,599)
Income tax benefit |  |  |  |  |  |  |  |  | 4,138 | 23,661 | 9,675
Net loss from discontinued operations |  |  |  |  |  |  |  |  | (7,035) | (41,443) | (17,924)
Assets: |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 0 |  |  |  | 5,072 |  |  |  | 0 | 5,072 |
Inventories | 0 |  |  |  | 9,078 |  |  |  | 0 | 9,078 |
Other current assets | 0 |  |  |  | 278 |  |  |  | 0 | 278 |
Long-term receivable | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Property and equipment, net | 0 |  |  |  | 11,277 |  |  |  | 0 | 11,277 |
Goodwill | 0 |  |  |  | 15,333 |  |  |  | 0 | 15,333 |
Other intangible assets, net | 0 |  |  |  | 7,395 |  |  |  | 0 | 7,395 |
Assets held for sale | 0 |  |  |  | 48,433 |  |  |  | 0 | 48,433 |
Valuation allowance | 0 |  |  |  | (18,971) |  |  |  | 0 | (18,971) |
Assets held for sale, net | 0 |  |  |  | 29,462 |  |  |  | 0 | 29,462 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 0 |  |  |  | 2,472 |  |  |  | 0 | 2,472 |
Accrued liabilities | 0 |  |  |  | 1,190 |  |  |  | 0 | 1,190 |
Liabilities held for sale | 0 |  |  |  | 3,662 |  |  |  | 0 | 3,662 |
Discontinued Operations, Held-for-sale | Production Technologies |  |  |  |  |  |  |  |  |  |  |
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,002 | 8,292 | 12,281
Cost of revenue |  |  |  |  |  |  |  |  | (3,236) | (7,881) | (10,179)
Selling, general and administrative |  |  |  |  |  |  |  |  | (1,759) | (3,790) | (4,158)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | (584) | (658)
Research and development |  |  |  |  |  |  |  |  | (364) | (888) | (596)
Gain (loss) on disposal of long-lived assets |  |  |  |  |  |  |  |  | 0 | (50) | 3
Impairment of inventory and long-lived assets |  |  |  |  |  |  |  |  | 0 | (3,913) | (804)
Loss from operations |  |  |  |  |  |  |  |  | (1,357) | (8,814) | (4,111)
Other expense |  |  |  |  |  |  |  |  | (52) | (96) | (40)
Loss on sale of businesses |  |  |  |  |  |  |  |  | (479) | 0 | 0
Loss on write-down of assets held for sale |  |  |  |  |  |  |  |  | (9,718) | (6,161) | 0
Loss before income taxes |  |  |  |  |  |  |  |  | (11,606) | (15,071) | (4,151)
Income tax benefit |  |  |  |  |  |  |  |  | 4,299 | 5,477 | 1,455
Net loss from discontinued operations |  |  |  |  |  |  |  |  | (7,307) | (9,594) | $ (2,696)
Assets: |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 0 |  |  |  | 1,784 |  |  |  | 0 | 1,784 |
Inventories | 0 |  |  |  | 8,115 |  |  |  | 0 | 8,115 |
Other current assets | 0 |  |  |  | 370 |  |  |  | 0 | 370 |
Long-term receivable | 0 |  |  |  | 4,179 |  |  |  | 0 | 4,179 |
Property and equipment, net | 0 |  |  |  | 3,978 |  |  |  | 0 | 3,978 |
Goodwill | 0 |  |  |  | 1,689 |  |  |  | 0 | 1,689 |
Other intangible assets, net | 0 |  |  |  | 484 |  |  |  | 0 | 484 |
Assets held for sale | 0 |  |  |  | 20,599 |  |  |  | 0 | 20,599 |
Valuation allowance | 0 |  |  |  | (6,161) |  |  |  | 0 | (6,161) |
Assets held for sale, net | 0 |  |  |  | 14,438 |  |  |  | 0 | 14,438 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 0 |  |  |  | 914 |  |  |  | 0 | 914 |
Accrued liabilities | 0 |  |  |  | 385 |  |  |  | 0 | 385 |
Liabilities held for sale | $ 0 |  |  |  | $ 1,299 |  |  |  | $ 0 | $ 1,299 |

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