ACQUISITIONS AND DISPOSITION (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended			9 Months Ended
		Jan. 23, 2015	Jul. 25, 2014	Jun. 19, 2014	Sep. 30, 2015	Sep. 30, 2014		Sep. 30, 2015	Sep. 30, 2014		Mar. 31, 2015	Dec. 31, 2014	[2]
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired								$ 0	$ 206,536
Revenues					$ 144,161	$ 156,341	[1]	431,834	338,426	[1]
Operating income (loss)					7,307	4,361	[1]	23,805	10,956	[1]
Liabilities assumed [Abstract]
Goodwill					122,006			122,006				$ 118,369
Consideration transferred [Abstract]
Deferred consideration								0	2,157
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			3,200
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
Deductible for tax purposes from goodwill					17,700			17,700
Assets acquired [Abstract]
Cash				$ 20,912
Accounts receivable				29,389
Inventories				36,429
Other current assets				7,350
Property, plant and equipment				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				(46,685)
Total liabilities assumed				(98,187)
Net identifiable assets acquired				75,399
Goodwill				55,393
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	[3]			(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	[4]			(4,623)
Total liabilities assumed				(4,623)
Net identifiable assets acquired				(5,683)
Goodwill				5,683
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
Deductible for tax purposes from goodwill					3,200			3,200
Assets acquired [Abstract]
Cash	[5]		6,544
Accounts receivable	[5]		9,375
Inventories	[5]		17,632
Other current assets	[5]		854
Property, plant and equipment	[5]		9,900
Intangible assets	[5]		40,000
Other assets	[5]		4,733
Total identifiable assets	[5]		89,038
Liabilities assumed [Abstract]
Accounts payable	[5]		(10,682)
Accrued expenses	[5]		(5,231)
Other current liabilities	[5]		889
Noncurrent liabilities	[5]		(18,666)
Total liabilities assumed	[5]		(33,690)
Net identifiable assets acquired	[5]		55,348
Goodwill	[5]		50,009
Net assets acquired	[5]		105,357
Consideration transferred [Abstract]
Cash Paid	[5]		105,357
Assumption of liability	[5]		0
Fair value of consideration transferred	[5]		105,357
Deferred consideration	[5]		0
Total consideration paid	[5]		105,357
Connectivity Solutions [Member] | As Reported [Member]
Assets acquired [Abstract]
Cash	[5]		6,544
Accounts receivable	[5]		9,375
Inventories	[5]		17,632
Other current assets	[5]		2,615
Property, plant and equipment	[5]		9,900
Intangible assets	[5]		40,000
Other assets	[5]		2,345
Total identifiable assets	[5]		88,411
Liabilities assumed [Abstract]
Accounts payable	[5]		(10,682)
Accrued expenses	[5]		(5,307)
Other current liabilities	[5]		(57)
Noncurrent liabilities	[5]		(17,314)
Total liabilities assumed	[5]		(33,360)
Net identifiable assets acquired	[5]		55,051
Goodwill	[5]		50,306
Net assets acquired	[5]		105,357
Consideration transferred [Abstract]
Cash Paid	[5]		105,357
Assumption of liability	[5]		0
Fair value of consideration transferred	[5]		105,357
Deferred consideration	[5]		0
Total consideration paid	[5]		105,357
Connectivity Solutions [Member] | Measurement Period Adjustments [Member]
Assets acquired [Abstract]
Cash			0
Accounts receivable			0
Inventories			0
Other current assets	[4]		(1,761)
Property, plant and equipment			0
Intangible assets			0
Other assets	[4]		2,388
Total identifiable assets			627
Liabilities assumed [Abstract]
Accounts payable			0
Accrued expenses			76
Other current liabilities	[4]		946
Noncurrent liabilities	[4]		(1,352)
Total liabilities assumed			(330)
Net identifiable assets acquired			297
Goodwill			(297)
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
2014 Acquired Companies [Member]
Business Acquisition [Line Items]
Acquisition-related costs					100	3,800		600	5,300
Revenues					57,700	63,100		175,000	70,300
Operating income (loss)					5,300			13,000
Assets acquired [Abstract]
Cash					27,456			27,456
Accounts receivable					38,764			38,764
Inventories					54,061			54,061
Other current assets					8,204			8,204
Property, plant and equipment					37,015			37,015
Intangible assets					73,220			73,220
Other assets					23,904			23,904
Total identifiable assets					262,624			262,624
Liabilities assumed [Abstract]
Accounts payable					(36,862)			(36,862)
Accrued expenses					(30,776)			(30,776)
Other current liabilities					1,112			1,112
Noncurrent liabilities					(65,351)			(65,351)
Total liabilities assumed					(131,877)			(131,877)
Net identifiable assets acquired					130,747			130,747
Goodwill					105,402			105,402
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						163,040			480,519
Net earnings						8,171			6,772
2014 Acquired Companies [Member] | Maximum [Member]
Business Acquisition [Line Items]
Operating income (loss)						$ (100)			$ (1,000)
2014 Acquired Companies [Member] | Class A [Member]
Unaudited Pro forma Consolidated Results of Operations [Abstract]
Net earnings per common share - basic and diluted (in dollars per share)						$ 0.66			$ 0.54
2014 Acquired Companies [Member] | Class B [Member]
Unaudited Pro forma Consolidated Results of Operations [Abstract]
Net earnings per common share - basic and diluted (in dollars per share)						$ 0.70			$ 0.59

[1] (Revised)

[2] Revised

[3] 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.

[4] Primarily represents the impact to deferred taxes reflecting the finalization of the allocation of identifiable intangible assets acquired.

[5] 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 fair values as of the respective acquisition dates.