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Operating Segments (Details) ton in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) ton | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) ton segment | Dec. 31, 2015 USD ($) jacket | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Divisions | segment |  |  |  |  |  |  |  |  | 3 |  |
Revenue | $ 55,461 | $ 65,384 | $ 81,502 | $ 83,979 | $ 55,018 | $ 67,531 | $ 84,338 | $ 99,233 | $ 286,326 | $ 306,120 | $ 506,639
Gross profit (loss) | (172) | 5,259 | 14,066 | 5,701 | (17,572) | (7,837) | 5,805 | 4,448 | 24,853 | (15,156) | 44,556
Operating income (loss) |  |  |  |  |  |  |  |  | 5,183 | (38,614) | 23,947
Depreciation expense |  |  |  |  |  |  |  |  | 25,448 | 26,204 | 26,436
Capital expenditures |  |  |  |  |  |  |  |  | 6,795 | 6,018 | 27,658
Total Assets | 322,408 |  |  |  | 316,923 |  |  |  | 322,408 | 316,923 | 397,943
Net (loss) income | (3,555) | $ 541 | $ 5,540 | $ 989 | (14,667) | $ (12,137) | $ 1,357 | $ 83 | 3,515 | (25,364) | 15,320
Recognition of deferred revenue |  |  |  |  |  |  |  |  | 5,223 | $ 0 | 0
Number of jackets and piles constructed | jacket |  |  |  |  |  |  |  |  |  | 5 |
Operating Segments | Fabrication |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 88,683 | $ 151,576 | 303,880
Gross profit (loss) |  |  |  |  |  |  |  |  | 5,061 | (37,541) | 19,418
Operating income (loss) |  |  |  |  |  |  |  |  | (1,039) | (54,036) | 4,079
Depreciation expense |  |  |  |  |  |  |  |  | 18,566 | 22,045 | 22,524
Capital expenditures |  |  |  |  |  |  |  |  | 2,633 | 3,360 | 23,245
Total Assets | 272,292 |  |  |  | 310,790 |  |  |  | 272,292 | 310,790 | 396,806
Operating Segments | Shipyards |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 109,502 | 59,601 | 79,197
Gross profit (loss) |  |  |  |  |  |  |  |  | 7,587 | 8,665 | 4,922
Operating income (loss) |  |  |  |  |  |  |  |  | (163) | 6,973 | 3,262
Depreciation expense |  |  |  |  |  |  |  |  | 4,686 | 1,921 | 1,805
Capital expenditures |  |  |  |  |  |  |  |  | 1,861 | 1,206 | 2,135
Total Assets | 81,928 |  |  |  | 54,543 |  |  |  | 81,928 | 54,543 | 63,090
Operating Segments | Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 91,414 | 100,431 | 132,107
Gross profit (loss) |  |  |  |  |  |  |  |  | 12,205 | 13,726 | 20,258
Operating income (loss) |  |  |  |  |  |  |  |  | 6,568 | 9,548 | 17,502
Depreciation expense |  |  |  |  |  |  |  |  | 1,775 | 1,733 | 1,612
Capital expenditures |  |  |  |  |  |  |  |  | 1,495 | 1,379 | 2,083
Total Assets | 96,404 |  |  |  | 94,618 |  |  |  | 96,404 | 94,618 | 95,385
Corp. & Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (3,273) | (5,488) | (8,545)
Gross profit (loss) |  |  |  |  |  |  |  |  | 0 | (6) | (42)
Operating income (loss) |  |  |  |  |  |  |  |  | (183) | (1,099) | (896)
Depreciation expense |  |  |  |  |  |  |  |  | 421 | 505 | 495
Capital expenditures |  |  |  |  |  |  |  |  | 806 | 73 | 195
Total Assets | (128,216) |  |  |  | $ (143,028) |  |  |  | (128,216) | (143,028) | $ (157,338)
LEEVAC |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 75,600 | 87,239 |
Total Assets | $ 52,200 |  |  |  |  |  |  |  | 52,200 |  |
Net (loss) income |  |  |  |  |  |  |  |  | (1,800) | $ (4,655) |
Recognition of deferred revenue |  |  |  |  |  |  |  |  | 5,200 |  |
LEEVAC | Shipyards |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 75,600 |  |
Net (loss) income |  |  |  |  |  |  |  |  | (1,800) |  |
Recognition of deferred revenue |  |  |  |  |  |  |  |  | $ 5,200 |  |
Prospect Shipyard |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current dry dock lift capacity | ton | 9 |  |  |  |  |  |  |  | 9 |  |
Expected dry dock lift capacity | ton | 15 |  |  |  |  |  |  |  | 15 |  |

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