ACQUISITIONS AND DISPOSITION (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		6 Months Ended
		Jan. 23, 2015	Jul. 25, 2014	Jun. 19, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	[1]
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired							$ 0	$ 109,879
Revenues					$ 145,658	$ 99,439	287,673	182,085
Operating income (loss)					7,452	3,714	16,498	6,595
Liabilities assumed [Abstract]
Goodwill					122,287		122,287		$ 118,369
Network Power Systems [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 9,000
Proceeds from sale of business in escrow		$ 1,000
Number of months of manufacturing service agreement		24 months
Deferred revenue		$ 9,000
Disposal of assets, net sales					1,100		2,100
Power Solutions [Member]
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired				$ 109,900
Percentages of owned joint venture investment (in hundredths)				49.00%
Deductible for tax purposes from goodwill					56,300		56,300
Revenues						7,200		7,200
Operating income (loss)						(1,000)		(1,000)
Assets acquired [Abstract]
Cash				$ 20,912
Accounts receivable				29,389
Inventories				36,429
Other current assets				7,350
Property, plant and equipment	[2]			27,115
Intangible assets				33,220
Other assets				19,171
Total identifiable assets				173,586
Liabilities assumed [Abstract]
Accounts payable				(26,180)
Accrued expenses				(25,545)
Other current liabilities				223
Noncurrent liabilities	[3]			(49,260)
Total liabilities assumed				(100,762)
Net identifiable assets acquired				72,824
Goodwill				57,968
Net assets acquired				130,792
Consideration transferred [Abstract]
Cash Paid				130,792
Assumption of liability				0
Fair value of consideration transferred				130,792
Deferred consideration				0
Total consideration paid				130,792
Power Solutions [Member] | As Reported [Member]
Assets acquired [Abstract]
Cash				20,912
Accounts receivable				29,389
Inventories				36,429
Other current assets				7,350
Property, plant and equipment				28,175
Intangible assets				33,220
Other assets				19,171
Total identifiable assets				174,646
Liabilities assumed [Abstract]
Accounts payable				(26,180)
Accrued expenses				(25,545)
Other current liabilities				223
Noncurrent liabilities				(42,062)
Total liabilities assumed				(93,564)
Net identifiable assets acquired				81,082
Goodwill				49,710
Net assets acquired				130,792
Consideration transferred [Abstract]
Cash Paid				130,792
Assumption of liability				0
Fair value of consideration transferred				130,792
Deferred consideration				0
Total consideration paid				130,792
Power Solutions [Member] | Measurement Period Adjustments [Member]
Assets acquired [Abstract]
Cash				0
Accounts receivable				0
Inventories				0
Other current assets				0
Property, plant and equipment	[2]			(1,060)
Intangible assets				0
Other assets				0
Total identifiable assets				(1,060)
Liabilities assumed [Abstract]
Accounts payable				0
Accrued expenses				0
Other current liabilities				0
Noncurrent liabilities	[3]			(7,198)
Total liabilities assumed				(7,198)
Net identifiable assets acquired				(8,258)
Goodwill				8,258
Net assets acquired				0
Consideration transferred [Abstract]
Cash Paid				0
Assumption of liability				0
Fair value of consideration transferred				0
Deferred consideration				0
Total consideration paid				$ 0
Connectivity Solutions [Member]
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired			$ 98,800
Assets acquired [Abstract]
Cash	[4]		6,544
Accounts receivable	[4]		9,375
Inventories	[4]		17,632
Other current assets	[4]		2,615
Property, plant and equipment	[4]		9,900
Intangible assets	[4]		40,000
Other assets	[4]		2,345
Total identifiable assets	[4]		88,411
Liabilities assumed [Abstract]
Accounts payable	[4]		(10,682)
Accrued expenses	[4]		(5,307)
Other current liabilities	[4]		(57)
Noncurrent liabilities	[4]		(17,314)
Total liabilities assumed	[4]		(33,360)
Net identifiable assets acquired	[4]		55,051
Goodwill	[4]		50,306
Net assets acquired	[4]		105,357
Consideration transferred [Abstract]
Cash Paid	[4]		105,357
Assumption of liability	[4]		0
Fair value of consideration transferred	[4]		105,357
Deferred consideration	[4]		0
Total consideration paid	[4]		$ 105,357
2014 Acquired Companies [Member]
Business Acquisition [Line Items]
Acquisition-related costs					100	1,500	500	1,500
Revenues					58,400		117,200
Operating income (loss)					(1,200)		4,400
Assets acquired [Abstract]
Cash					27,456		27,456
Accounts receivable					38,764		38,764
Inventories					54,061		54,061
Other current assets					9,965		9,965
Property, plant and equipment					37,015		37,015
Intangible assets					73,220		73,220
Other assets					21,516		21,516
Total identifiable assets					261,997		261,997
Liabilities assumed [Abstract]
Accounts payable					(36,862)		(36,862)
Accrued expenses					(30,852)		(30,852)
Other current liabilities					166		166
Noncurrent liabilities					(66,574)		(66,574)
Total liabilities assumed					(134,122)		(134,122)
Net identifiable assets acquired					127,875		127,875
Goodwill					108,274		108,274
Net assets acquired					$ 236,149		236,149
Consideration transferred [Abstract]
Cash Paid							236,149
Assumption of liability							0
Fair value of consideration transferred							236,149
Deferred consideration							0
Total consideration paid							$ 236,149
Unaudited Pro forma Consolidated Results of Operations [Abstract]
Revenue						156,842		317,479
Net loss						$ (3,057)		$ (1,399)
2014 Acquired Companies [Member] | Class A [Member]
Unaudited Pro forma Consolidated Results of Operations [Abstract]
Loss per common share - basic and diluted (in dollars per share)						$ (0.26)		$ (0.13)
2014 Acquired Companies [Member] | Class B [Member]
Unaudited Pro forma Consolidated Results of Operations [Abstract]
Loss per common share - basic and diluted (in dollars per share)						$ (0.27)		$ (0.12)

[1] Revised

[2] Represents the purchase accounting adjustments reflecting the finalization of the acquisition-date fair values of property, plant and equipment associated with completion of third-party valuations.

[3] Represents the impact to deferred taxes reflecting the finalization of the allocation of identifiable intangible assets acquired.

[4] The Company acquired the U.S. and U.K. entities of Connectivity Solutions on July 25, 2014 and the China entity of Connectivity Solutions on August 29, 2014. These values represent the estimated fair values as of the respective acquisition dates.