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Organization and Summary of Significant Accounting Policies (Details) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 20, 2018 USD ($) | Jan. 03, 2018 USD ($) | Mar. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 4 |
Operating loss carryforwards |  |  |  | $ 62,800
Valuation allowance |  |  | $ 1,400 | 392
Expire In 2035 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating loss carryforwards |  |  |  | $ 4,000
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Proceeds from sale of PP&E |  | $ 750 |  |
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations | Subsequent Event |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Sale of PP&E | $ 55,000 |  |  |
Cost of PP&E sales | 1,500 |  |  |
Proceeds from sale of PP&E | $ 52,700 |  |  |

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