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REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 27,187	$ 31,445	$ 36,781	$ 29,967	$ 17,768	$ 29,595	$ 43,362	$ 56,060	$ 125,380	$ 146,785
Revenue remaining performance obligation, practical expedient									true
Eliminations
Disaggregation of Revenue [Line Items]
Revenues									$ (130)
Towers and Heavy Fabrications
Disaggregation of Revenue [Line Items]
Revenues									68,815	103,389
Gearing
Disaggregation of Revenue [Line Items]
Revenues									38,376	26,006
Process Systems
Disaggregation of Revenue [Line Items]
Revenues									$ 18,319	$ 17,390

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