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Assets Held for Sale - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) machine crane | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Gain on sale of assets held for sale, net |  |  | $ 369 | $ 3,853 |
Recoveries from insurance claims |  |  | 0 | 2,165 |
Insured event, gain |  |  | 0 | 3,342 |
Proceeds from sale of property, plant and equipment |  |  | 1,598 | 56,446 |
Impairment of Long-Lived Assets to be Disposed of |  | $ 600 |  |  |
Asset impairment and (gain) loss on assets held for sale, net |  |  | (100) | 1,400 |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  | 18,737 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Fabrication Division |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  | $ 17,813 |  |
Number of cranes | crane |  |  | 3 |  |
Number of bending roll machines | machine |  |  | 2 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | South Texas Fabrication Yards |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Recoveries from insurance claims | $ 7,200 |  |  | 2,200 | $ 6,000
Insurance recoveries |  | 9,000 |  |  | $ 3,200
Insurance settlement |  | 15,400 |  | 15,400 |
Insured event, gain |  | 3,600 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Shipyard Division |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  | $ 924 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fabrication Division |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  |  | 17,800 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | South Texas Fabrication Yards |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Net proceeds from sale of assets |  |  |  | 53,800 |
Gain on sale of assets held for sale, net |  | $ 3,900 |  | 3,900 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Other |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Proceeds from sale of property, plant and equipment |  |  | $ 400 | $ 200 |

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