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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