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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) Project | Dec. 31, 2018 USD ($) vessel Project | Dec. 31, 2017 USD ($) Project | Dec. 31, 2016 USD ($)
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |
Bad debt expense |  | $ 30 | $ 21 | $ 493
Allowance for bad debt | $ 400 | 400 | 1,900 |
Increase in operating loss due to change in estimates |  | 9,100 |  | $ 1,800
Revenue, variable consideration, contract price reduction | 11,200 | 11,200 | 11,700 |
Contract assets, noncurrent | $ 12,452 | $ 12,452 | 0 |
Number of uncompleted projects | Project | 9 | 9 |  |
Number of harbor tug vessels | vessel |  | 10 |  |
Fabrication |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |
Increase in operating loss due to change in estimates |  | $ 2,400 |  |
Shipyard |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |
Increase in operating loss due to change in estimates | $ 5,800 | $ 6,700 | $ 34,500 |
Number of projects in a loss position | Project |  |  | 2 |
Sales Revenue, Net | Geographic Concentration Risk | Non-US |  |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |  |
Concentration risk, percentage |  | 0.00% | 0.00% | 14.00%

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