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Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 | $ 1,502 |  | $ 1,502 |  | $ 28,927
Disposal Group Including Discontinued Operation Revenue | 10 | $ 28,437 | 4,674 | $ 37,029 |
Disposal Group, Including Discontinued Operation, Cost of Revenue | (333) | 28,247 | 11,027 | 39,273 |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 0 | 2,836 | 2,085 | 5,789 |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 284 | 1,768 | 1,724 | 3,474 |
Disposal Group, Including Discontinued Operation, Interest Expense | 55 | 2,153 |  |  |
Disposal Group, Including Discontinued Operation, Other Expense |  |  | 78 | 2,058 |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | 4 | (6,567) | (10,240) | (13,565) |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | (25) | 0 | (33,813) | 0 |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax | (21) | (6,567) | (44,053) | (13,565) |
Discontinued Operation, Tax Effect of Discontinued Operation | 0 | 86 | (2,326) | 95 |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (21) | (6,653) | (41,727) | (13,660) |
Disposal Group, Including Discontinued Operation, Inventory | 0 |  | 0 |  | 4,616
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 0 |  | 0 |  | 85,873
Disposal Group, Including Discontinued Operation, Assets, Other Assets | 36 |  | 36 |  | 1,718
Disposal Group, Including Discontinued Operation, Assets | 1,538 | 121,134 | 1,538 | 121,134 | 121,134
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 1,676 |  | 1,676 |  | 14,029
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 6,667 |  | 6,667 |  | 13,222
Disposal Group, Including Discontinued Operation, Liabilities, Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 46,662
Disposal Group, Including Discontinued Operation, Liabilities | 8,343 |  | 8,343 |  | 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 | 175 | 187 | 406 |
Disposal Group, Including Discontinued Operation, Cost of Revenue | (98) | 314 | 139 | 601 |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 0 | 373 | 212 | 743 |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 0 | 174 | 187 | 411 |
Disposal Group, Including Discontinued Operation, Interest Expense | 0 |  |  |  |
Disposal Group, Including Discontinued Operation, Other Expense |  |  | 0 |  |
Disposal Group, Including Discontinued Operation, Other Income |  | (565) |  | (565) |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | 98 | (121) | (351) | (784) |
Disposal Group, Including Discontinued Operation, Inventory | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Assets, Other Assets | (18) |  | (18) |  | 44
Disposal Group, Including Discontinued Operation, Assets | 1,323 |  | 1,323 |  | 1,586
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 0 |  | 0 |  | 87
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 2,059 |  | 2,059 |  | 2,278
Disposal Group, Including Discontinued Operation, Liabilities, Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 46,662
Disposal Group, Including Discontinued Operation, Liabilities | 2,059 |  | 2,059 |  | 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 | 161 |  | 161 |  | 27,385
Disposal Group Including Discontinued Operation Revenue | 10 | 28,262 | 4,487 | 36,623 |
Disposal Group, Including Discontinued Operation, Cost of Revenue | (235) | 27,933 | 10,888 | 38,672 |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization | 0 | 2,463 | 1,873 | 5,046 |
Disposal Group, Including Discontinued Operation, General and Administrative Expense | 284 | 1,594 | 1,537 | 3,063 |
Disposal Group, Including Discontinued Operation, Interest Expense | 55 | 2,718 |  |  |
Disposal Group, Including Discontinued Operation, Other Expense |  |  | 78 | 2,623 |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax | (94) | $ (6,446) | (9,889) | $ (12,781) |
Disposal Group, Including Discontinued Operation, Inventory | 0 |  | 0 |  | 4,616
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 0 |  | 0 |  | 85,873
Disposal Group, Including Discontinued Operation, Assets, Other Assets | 54 |  | 54 |  | 1,674
Disposal Group, Including Discontinued Operation, Assets | 215 |  | 215 |  | 119,548
Disposal Group, Including Discontinued Operation, Accounts Payable, Current | 1,676 |  | 1,676 |  | 13,942
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current | 4,608 |  | 4,608 |  | 10,944
Disposal Group, Including Discontinued Operation, Liabilities, Decommissioning and Asset Retirement Obligations | 0 |  | 0 |  | 0
Disposal Group, Including Discontinued Operation, Liabilities | $ 6,284 |  | $ 6,284 |  | $ 24,886

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period from a disposal group, including discontinued operations. + References No definition available. + Details
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- Definition Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 + Details
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- Definition Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(12)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1012-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721523-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(14)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 + Details
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- Definition Amount before tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until its disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721523-107759 + Details
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- Definition Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721523-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e38679-109324 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1012-107759 + Details
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- Definition Amount classified as accounts payable attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2473-110228 + Details
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- Definition Amount classified as accrued liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2473-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 + Details
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- Definition Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 + Details
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- Definition Amount of interest expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26872618&loc=d3e7436-122677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1063-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1060-107759 + Details
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- Definition Amount classified as inventory attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
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- Definition Amount of other expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 + Details
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