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INVENTORIES (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Raw materials $ 28,837   $ 21,385
Work-in-process 11,907   9,565
Finished goods 5,993   6,769
Gross inventories 46,737   37,719
Less: Inventory Reserve (3,585)   (2,798)
Net inventories 43,152   $ 34,921
Increase in inventories 8,231 $ (849)  
Towers and Weldments Segment      
Increase in inventories $ 8,485