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REVENUE RECOGNITION (Textual) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]    
Percentage Net Sales Over Time (less than) 10.00%  
Customer Advances, Current $ 21,158 $ 19,683
Billings in Excess of Cost, Current 15,406 11,132
Unbilled Contracts Receivable $ 27,880 $ 22,229