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DISPOSITION - SALE OF NPS (Details) - Network Power Systems [Member] - USD ($)
$ in Millions
12 Months Ended
Jan. 23, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disposition Sale of NPS [Abstract]        
Number of months of manufacturing service agreement   24 months    
Deferred revenue $ 9.0      
Disposal of assets, net sales     $ 4.5 $ 4.5
Unipower LLC [Member]        
Disposition Sale of NPS [Abstract]        
Proceeds from sale of business 9.0      
Escrow on sale of business assets $ 1.0