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Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | $ (1,288) |  | $ (1,288) |  | $ (28,927)
Disposal Group Including Discontinued Operation Revenue | 0 | $ 32,688 | 4,674 | $ 69,717 |
Disposal Group, Including Discontinued Operation, Cost of Revenue | 125 | 28,576 | 11,152 | 67,849 |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 0 | 3,258 | 2,085 | 9,047 |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 192 | 1,522 | 1,916 | 4,996 |
Disposal Group, Including Discontinued Operation, Other Expense |  |  |  | 1,852 |
Disposal Group, Including Discontinued Operation, Other Income | (1,113) | (206) | (1,035) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | 796 | (462) | (9,444) | (14,027) |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  | (33,813) | 0 |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  | (43,257) | (14,027) |
Discontinued Operation, Tax Effect of Discontinued Operation | 0 | 19 | (2,326) | 114 |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 796 | (481) | (40,931) | (14,141) |
Disposal Group, Including Discontinued Operation, Inventory | 0 |  | 0 |  | 4,616
Disposal Group, Including Discontinued Operation, Other Assets, Current | 13 |  | 13 |  | 1,336
Disposal Group, Including Discontinued Operation, Assets, Current | (1,301) |  | (1,301) |  | (34,879)
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 0 |  | 0 |  | 85,873
Disposal Group, Including Discontinued Operation, Assets, Other Assets | 0 |  | 0 |  | 382
Disposal Group, Including Discontinued Operation, Assets, Noncurrent | 0 |  | 0 |  | 86,255
Disposal Group, Including Discontinued Operation, Assets | (1,301) | (121,134) | (1,301) | (121,134) | (121,134)
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 0 |  | 0 |  | 14,029
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 3,570 |  | 3,570 |  | 11,182
Disposal Group, Including Discontinued Operation, Liabilities, Current Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 477
Disposal Group, Including Discontinued Operation, Liabilities, Current | 3,570 |  | 3,570 |  | 25,688
Disposal Group, Including Discontinued Operation, Liabilities, Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 46,185
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent | 0 |  | 0 |  | 2,040
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent | 0 |  | 0 |  | 48,225
Disposal Group, Including Discontinued Operation, Liabilities | 3,570 |  | 3,570 |  | 73,913
Maritech [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | (1,341) |  | (1,341) |  | (1,542)
Disposal Group Including Discontinued Operation Revenue | 0 | 21 | 187 | 427 |
Disposal Group, Including Discontinued Operation, Cost of Revenue | 0 | 386 | 139 | 987 |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 0 | 372 | 212 | 1,115 |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 0 | 177 | 187 | 588 |
Disposal Group, Including Discontinued Operation, Other Income | 0 | 0 | 0 | (565) |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | 0 | (914) | (351) | (1,698) |
Disposal Group, Including Discontinued Operation, Inventory | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Other Assets, Current | 0 |  | 0 |  | 44
Disposal Group, Including Discontinued Operation, Assets, Current | (1,341) |  | (1,341) |  | (1,586)
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Assets, Other Assets | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Assets, Noncurrent | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Assets | (1,341) |  | (1,341) |  | (1,586)
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 0 |  | 0 |  | 87
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 2,075 |  | 2,075 |  | 2,278
Disposal Group, Including Discontinued Operation, Liabilities, Current Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 477
Disposal Group, Including Discontinued Operation, Liabilities, Current | 2,075 |  | 2,075 |  | 2,842
Disposal Group, Including Discontinued Operation, Liabilities, Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 46,185
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent | 0 |  | 0 |  | 46,185
Disposal Group, Including Discontinued Operation, Liabilities | 2,075 |  | 2,075 |  | 49,027
Offshore Services [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | (53) |  | (53) |  | (27,385)
Disposal Group Including Discontinued Operation Revenue | 0 | 32,667 | 4,487 | 69,290 |
Disposal Group, Including Discontinued Operation, Cost of Revenue | 125 | 28,190 | 11,013 | 66,862 |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 0 | 2,886 | 1,873 | 7,932 |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 192 | 1,345 | 1,729 | 4,408 |
Disposal Group, Including Discontinued Operation, Other Expense |  |  |  | 2,417 |
Disposal Group, Including Discontinued Operation, Other Income | (1,113) | (206) | (1,035) |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | 796 | $ 452 | (9,093) | $ (12,329) |
Disposal Group, Including Discontinued Operation, Inventory | 0 |  | 0 |  | 4,616
Disposal Group, Including Discontinued Operation, Other Assets, Current | 13 |  | 13 |  | 1,292
Disposal Group, Including Discontinued Operation, Assets, Current | (40) |  | (40) |  | (33,293)
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 0 |  | 0 |  | 85,873
Disposal Group, Including Discontinued Operation, Assets, Other Assets | 0 |  | 0 |  | 382
Disposal Group, Including Discontinued Operation, Assets, Noncurrent | 0 |  | 0 |  | 86,255
Disposal Group, Including Discontinued Operation, Assets | (40) |  | (40) |  | (119,548)
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 0 |  | 0 |  | 13,942
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 1,495 |  | 1,495 |  | 8,904
Disposal Group, Including Discontinued Operation, Liabilities, Current Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Liabilities, Current | 1,495 |  | 1,495 |  | 22,846
Disposal Group, Including Discontinued Operation, Liabilities, Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent | 0 |  | 0 |  | 2,040
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent | 0 |  | 0 |  | 2,040
Disposal Group, Including Discontinued Operation, Liabilities | $ 1,495 |  | $ 1,495 |  | $ 24,886

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