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Discontinued Operations (Notes) | 3 Months Ended
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Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] | DISCONTINUED OPERATIONS As discussed in Note B - "Acquisitions and Dispositions," on March 1, 2018, we closed a series of related transactions that resulted in the disposition of our Offshore Division. As a result, we have accounted for our Offshore Division, consisting of our Offshore Services and Maritech segments, as discontinued operations and have revised prior period financial statements to exclude these businesses from continuing operations. A summary of financial information related to our discontinued operations is as follows: Reconciliation of the Line Items Constituting Pretax Loss from Discontinued Operations to the After-Tax Loss from Discontinued Operations (in thousands)
| Three Months Ended March 31, 2018 |  | Three Months Ended March 31, 2017
| Offshore Services |  | Maritech |  | Total |  | Offshore Services |  | Maritech |  | Total
Major classes of line items constituting pretax loss from discontinued operations |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 4,477 |  |  | $ | 186 |  |  | $ | 4,663 |  |  | $ | 8,361 |  |  | $ | 231 |  |  | $ | 8,592 |
Cost of revenues | 11,123 |  |  | 238 |  |  | 11,361 |  |  | 10,740 |  |  | 287 |  |  | 11,027 |
Depreciation, amortization, and accretion | 1,856 |  |  | 213 |  |  | 2,069 |  |  | 2,584 |  |  | 370 |  |  | 2,954 |
General and administrative expense | 1,253 |  |  | 186 |  |  | 1,439 |  |  | 1,468 |  |  | 237 |  |  | 1,705 |
Other (income) expense, net | 39 |  |  | — |  |  | 39 |  |  | (96 | ) |  | — |  |  | (96 | )
Pretax loss from discontinued operations | (9,794 | ) |  | (451 | ) |  | (10,245 | ) |  | (6,335 | ) |  | (663 | ) |  | (6,998 | )
Pretax loss on disposal of discontinued operations |  |  |  |  | (33,788 | ) |  |  |  |  |  | — |
Total pretax loss from discontinued operations |  |  |  |  | (44,033 | ) |  |  |  |  |  | (6,998 | )
Income tax benefit |  |  |  |  | (2,327 | ) |  |  |  |  |  | 9 |
Total loss from discontinued operations |  |  |  |  | $ | (41,706 | ) |  |  |  |  |  | $ | (7,007 | )
Reconciliation of Major Classes of Assets and Liabilities of the Discontinued Operations to Amounts Presented Separately in the Statement of Financial Position (in thousands)
| March 31, 2018 |  | December 31, 2017
| Offshore Services |  | Maritech |  | Total |  | Offshore Services |  | Maritech |  | Total
Carrying amounts of major classes of assets included as part of discontinued operations |  |  |  |  |  |  |  |  |  |  |
Trade receivables | $ | 6,474 |  |  | $ | 1,433 |  |  | $ | 7,907 |  |  | $ | 27,385 |  |  | $ | 1,542 |  |  | $ | 28,927 |
Inventories | — |  |  | — |  |  | — |  |  | 4,616 |  |  | — |  |  | 4,616 |
Property, plant, and equipment | — |  |  | — |  |  | — |  |  | 85,873 |  |  | — |  |  | 85,873 |
Other assets | — |  |  | — |  |  | — |  |  | 1,674 |  |  | 44 |  |  | 1,718 |
Total major classes of assets of the discontinued operations | $ | 6,474 |  |  | $ | 1,433 |  |  | $ | 7,907 |  |  | $ | 119,548 |  |  | $ | 1,586 |  |  | $ | 121,134 |
Carrying amounts of major classes of liabilities included as part of discontinued operations |  |  |  |  |  |  |  |  |  |  |
Trade payables | 6,509 |  |  | 228 |  |  | 6,737 |  |  | 13,942 |  |  | 87 |  |  | 14,029 |
Accrued liabilities | 5,328 |  |  | 2,222 |  |  | 7,550 |  |  | 8,905 |  |  | 2,278 |  |  | 11,183 |
Decommissioning and other asset retirement obligations | — |  |  | — |  |  | — |  |  | — |  |  | 46,662 |  |  | 46,662 |
Total major classes of liabilities of the discontinued operations | $ | 11,837 |  |  | $ | 2,450 |  |  | $ | 14,287 |  |  | $ | 22,847 |  |  | $ | 49,027 |  |  | $ | 71,874 |

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- Definition The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2122178 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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