GOODWILL AND OTHER INTANGIBLE ASSETS (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill
Balance, beginning	$ 10,948
No activity
Balance, ending	10,948
Accumulated impairment losses:
Balance, beginning	(976)
Balance, ending	(976)
Net Goodwill	9,972
T And D Segment [Member]
Goodwill
Balance, beginning	7,978
No activity
Balance, ending	7,978
Accumulated impairment losses:
Balance, beginning	(976)
Balance, ending	(976)
Net Goodwill	7,002
Critical Power Segment [Member]
Goodwill
Balance, beginning	2,970
No activity
Balance, ending	2,970
Accumulated impairment losses:
Net Goodwill	$ 2,970