ACQUISITIONS AND DISPOSITION (Details) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended										12 Months Ended
		Jul. 25, 2014	Jun. 19, 2014	Aug. 20, 2013	Mar. 29, 2013	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	[1]	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired																$ 0	$ 208,693	$ 30,994
Liabilities assumed [Abstract]
Goodwill						$ 121,634					$ 118,369					121,634	118,369	18,490
Consideration transferred [Abstract]
Revenues						135,246	$ 144,161	$ 145,658	$ 142,015		148,650	[2]	$ 156,341	$ 99,439	$ 82,646	567,080	487,076	349,189
Operating income (loss)																28,600	13,472	15,047
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 assets			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 [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 assets			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 assets			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		6,544
Accounts receivable		9,375
Inventories		17,632
Other current assets		854
Property, plant and equipment		9,900
Intangible assets		40,000
Other assets		4,733
Total identifiable assets		89,038
Liabilities assumed [Abstract]
Accounts payable		(10,682)
Accrued expenses		(5,231)
Other current assets		889
Noncurrent liabilities		(18,666)
Total liabilities assumed		(33,690)
Net identifiable assets acquired		55,348
Goodwill		50,009
Net assets acquired		105,357
Consideration transferred [Abstract]
Cash Paid		105,357
Assumption of liability		0
Fair value of consideration transferred		105,357
Deferred consideration		0
Total consideration paid		105,357
Connectivity Solutions [Member] | As Reported Member [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 assets	[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																600	7,300
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 assets											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
Revenues																230,300	134,300
Operating income (loss)																$ 10,300	(2,500)
Acquisition-related costs excluded from pro forma net earnings																	14,900	5,900
Acquisition-related costs incurred but excluded from pro forma earnings during the period after tax																	9,800	4,100
Unaudited Pro forma Consolidated Results of Operations
Revenue																	629,132	710,937
Net earnings																	$ 11,705	$ (65,299)
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	$ (5.52)
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	$ (5.77)
TRP [Member]
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired					$ 21,000
Array [Member]
Business Acquisition [Line Items]
Payment for acquisitions, net of cash acquired				$ 10,000
2013 Acquired Companies [Member]
Business Acquisition [Line Items]
Acquisition-related costs																	$ 100	$ 700

[1] Revised from 10-Q disclosures to reflect immaterial measurement period adjustments related to the 2014 Acquisitions. First quarter 10-Q reflected cost of sales of $114.9 million, net earnings of $5.6 million, earnings per Class A common share of $0.45 per share and earnings per Class B common share of $0.48 per share.

[2] Revised from the disclosure in the Annual Report on Form 10-K for the year ended December 31, 2014 to reflect immaterial measurement period adjustments related to the 2014 Acquisitions. The 2014 10-K reflected, for the fourth quarter of 2014, cost of sales of $120.8 million, net earnings of $2.0 million, earnings per Class A common share of $0.16 per share and earnings per Class B common share of $0.17 per share.

[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.