ACQUISITIONS AND DISPOSITION (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended	12 Months Ended
	Jan. 23, 2015	Jul. 25, 2014	Jun. 19, 2014	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired					$ 0	$ 0		$ 208,693
Revenues					500,153	567,080	[1]	487,076	[1]
Operating income (loss)					(76,512)	28,600	[1]	13,472	[1]
Disposition Sale of NPS [Abstract]
Deferred revenue					$ 0	4,500
Network Power Systems [Member]
Disposition Sale of NPS [Abstract]
Number of months of manufacturing service agreement					24 months
Deferred revenue	$ 9,000
Disposal of assets, net sales					$ 4,500	4,500
Network Power Systems [Member] | Unipower LLC [Member]
Disposition Sale of NPS [Abstract]
Proceeds from sale of business	9,000
Escrow on sale of business assets	$ 1,000
Power Solutions [Member]
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired			$ 109,900
Percentages of owned joint venture investment			49.00%
Other income				$ 4,200
Connectivity Solutions [Member]
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired		$ 98,800
2014 Acquired Companies [Member]
Business Acquisition [Line Items]
Acquisition-related costs						600		7,300
Revenues					195,600	230,300		134,300
Operating income (loss)					$ 3,800	$ 10,300		(2,500)
Acquisition-related costs excluded from pro forma net earnings								14,900
Acquisition-related costs incurred but excluded from pro forma earnings during the period after tax								9,800
Unaudited Pro forma Consolidated Results of Operations
Revenue								629,132
Net earnings								$ 11,705
2014 Acquired Companies [Member] | Class A [Member]
Unaudited Pro forma Consolidated Results of Operations
Earnings per common share - basic and diluted (in dollars per share)								$ 0.94
2014 Acquired Companies [Member] | Class B [Member]
Unaudited Pro forma Consolidated Results of Operations
Earnings per common share - basic and diluted (in dollars per share)								$ 1.02

[1] (Revised)