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RESTRUCTURING AND IMPAIRMENT (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Lease termination and other facility costs   $ 1,122
Business integration expenses $ 215 900
Other costs   182
Pre-tax restructuring and integration expense 215 2,204
T And D Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Lease termination and other facility costs   1,122
Business integration expenses 215 900
Other costs   150
Pre-tax restructuring and integration expense $ 215 2,172
Critical Power Segment [Member]    
Restructuring Cost and Reserve [Line Items]    
Other costs   32
Pre-tax restructuring and integration expense   $ 32