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Discontinued Operations Discontinued Operations Tables (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 31, 2019 | Mar. 01, 2018
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 | $ 0 | $ 1,340 |  |  |
Disposal Group, Including Discontinued Operation, Revenue | 0 | 4,674 | $ 97,279 |  |
Disposal Group, Including Discontinued Operation, Cost of Revenue | (192) | 11,290 | 93,738 |  |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 52 | 2,085 | 12,106 |  |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 2,618 | 2,104 | 6,488 |  |
Disposal Group, Including Discontinued Operation, Other Income |  | (1,036) |  |  |
Disposal Group, Including Discontinued Operation, Other Income | 235 |  | 1,888 |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | (2,713) | (9,769) | (16,941) |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | (7,500) | (34,072) | 0 |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | (10,213) | (43,841) | (16,941) |  |
Provision (benefit) for deferred income taxes | 0 | (2,326) | 448 |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (10,213) | (41,515) | (17,389) |  |
Disposal Group, Including Discontinued Operation, Other Assets, Current | 0 | 14 |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 1,354 |  |  |
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 1,233 | 740 |  |  |
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 865 | 3,405 |  |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 2,098 | 4,145 |  |  |
Offshore Division [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Reserve, Other Receivables |  |  |  | $ 1,500 |
Disposal Group, Including Discontinued Operation, Consideration, Additional Receivable |  |  |  |  | $ 7,500
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 | 0 | 0 |  |  |
Disposal Group, Including Discontinued Operation, Revenue | 0 | 4,487 | 96,741 |  |
Disposal Group, Including Discontinued Operation, Cost of Revenue | (192) | 11,151 | 92,674 |  |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 52 | 1,873 | 10,678 |  |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 2,618 | 1,917 | 5,705 |  |
Disposal Group, Including Discontinued Operation, Other Income |  | (1,036) |  |  |
Disposal Group, Including Discontinued Operation, Other Income | 117 |  | 2,453 |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | (2,595) | (9,418) | (14,769) |  |
Disposal Group, Including Discontinued Operation, Other Assets, Current | 0 | 14 |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 14 |  |  |
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 1,233 | 740 |  |  |
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 745 | 1,330 |  |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | 1,978 | 2,070 |  |  |
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 | 0 | 1,340 |  |  |
Disposal Group, Including Discontinued Operation, Revenue | 0 | 187 | 538 |  |
Disposal Group, Including Discontinued Operation, Cost of Revenue | 0 | 139 | 1,064 |  |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 0 | 212 | 1,428 |  |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 0 | 187 | 783 |  |
Disposal Group, Including Discontinued Operation, Other Income |  | 0 | (565) |  |
Disposal Group, Including Discontinued Operation, Other Income | 118 |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | (118) | (351) | $ (2,172) |  |
Disposal Group, Including Discontinued Operation, Other Assets, Current | 0 | 0 |  |  |
Disposal Group, Including Discontinued Operation, Assets, Current | 0 | 1,340 |  |  |
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 0 | 0 |  |  |
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 120 | 2,075 |  |  |
Disposal Group, Including Discontinued Operation, Liabilities, Current | $ 120 | $ 2,075 |  |  |

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