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CONTINGENCIES AND COMMITMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |
Loss related to cost overruns and re-work | $ 22,500 | $ 34,500
Estimated liquidated damages | $ 233 |
Maximum |  |
Loss Contingencies [Line Items] |  |
Estimated liquidated damages |  | $ 11,200

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