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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Contract Assets and Liabilities (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) vessel | Sep. 30, 2018 vessel | Dec. 31, 2017 USD ($)
Revenue from Contract with Customer [Abstract] |  |  |
Costs incurred on uncompleted contracts | $ 253,871 |  | $ 266,902
Estimated profit (loss) earned to date | (35,470) |  | (26,954)
Prepaid subcontractor costs | 2,368 |  | 0
Sub-total | 220,769 |  | 239,948
Billings to date | (190,588) |  | (224,329)
Deferred revenue | (4,592) |  | 0
Contract assets | 29,982 |  | 28,373
Contract liabilities | (16,845) |  | (12,754)
Sub-total | 13,137 |  | 15,619
Contract assets, noncurrent | 12,452 |  | 0
Total | $ 25,589 |  | 15,619
Number of multi-purpose service vessels | vessel | 2 | 2 |
Contract with customer, liability, revenue recognized | $ 5,100 |  |
Contract with customer, liability, accrued contract losses, current | $ 2,400 |  | $ 7,600

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