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CONTRACT REVENUE AND PERCENTAGE-OF-COMPLETION METHOD - Information with Respect to Uncompleted Contracts (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Revenue Recognition [Abstract] |  |
Costs incurred on uncompleted contracts | $ 266,902 | $ 246,424
Estimated profit (loss) earned to date | (19,336) | 21,363
Contract costs and estimated profits | 247,566 | 267,787
Less billings to date | 224,329 | 244,935
Net costs and estimated earnings in excess of billings | $ 23,237 | $ 22,852

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