ACQUISITIONS (Details)	3 Months Ended		12 Months Ended					12 Months Ended										0 Months Ended		12 Months Ended		0 Months Ended		0 Months Ended		12 Months Ended		0 Months Ended				0 Months Ended				12 Months Ended					12 Months Ended
	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 Trademarks [Member] USD ($)	Dec. 31, 2012 Trademarks [Member] USD ($)	Dec. 31, 2013 Technology [Member] USD ($)	Dec. 31, 2012 Technology [Member] USD ($)	Dec. 31, 2013 Customer Relationships [Member] USD ($)	Dec. 31, 2012 Customer Relationships [Member] USD ($)	Dec. 31, 2013 Noncompete Agreements [Member] USD ($)	Dec. 31, 2012 Noncompete Agreements [Member] USD ($)	Dec. 31, 2013 Class A [Member] USD ($)	Dec. 31, 2012 Class A [Member] USD ($)	Dec. 31, 2013 Class B [Member] USD ($)	Dec. 31, 2012 Class B [Member] USD ($)	Mar. 09, 2012 GigaCom Interconnect [Member] USD ($)	Mar. 09, 2012 GigaCom Interconnect [Member] EUR (€)	Dec. 31, 2013 GigaCom Interconnect [Member] USD ($)	Dec. 31, 2012 GigaCom Interconnect [Member] USD ($)	Jul. 31, 2012 Fibreco [Member] USD ($)	Jul. 31, 2012 Fibreco [Member] EUR (€)	Sep. 12, 2012 Powerbox Italy [Member] USD ($)	Sep. 12, 2012 Powerbox Italy [Member] Class B [Member] USD ($)	Dec. 31, 2013 Fibreco and Bel Power Europe [Member] USD ($)	Dec. 31, 2012 Fibreco and Bel Power Europe [Member] USD ($)	Mar. 29, 2013 TRP [Member] USD ($)	Mar. 09, 2013 TRP [Member] USD ($)	Mar. 09, 2013 TRP [Member] Measurement Period Adjustments [Member] USD ($)	Mar. 09, 2013 TRP [Member] Acquisition Date Fair Values (As adjusted) [Member] USD ($)	Aug. 20, 2013 Array [Member] USD ($)	Aug. 20, 2013 Array [Member] Measurement Period Adjustments [Member] USD ($)	Aug. 20, 2013 Array [Member] Acquisition Date Fair Values (As adjusted) [Member] USD ($)	Dec. 31, 2013 TRP and Array [Member] Acquisition Date Fair Values (As adjusted) [Member] USD ($)	Dec. 31, 2013 2012 Acquired Companies [Member] USD ($)	Dec. 31, 2012 2012 Acquired Companies [Member] USD ($)	Sep. 30, 2013 GigaCom, Fibreco and Bel Power Europe [Member] Acquisition Date Fair Values [Member] USD ($)	Sep. 30, 2013 GigaCom, Fibreco and Bel Power Europe [Member] Measurement Period Adjustments [Member] USD ($)	Sep. 30, 2013 GigaCom, Fibreco and Bel Power Europe [Member] Acquisition Date Fair Values (As adjusted) [Member] USD ($)	Dec. 31, 2013 2013 Acquired Companies [Member] USD ($)	Dec. 31, 2012 2013 Acquired Companies [Member] USD ($)
Acquired tax assets and liabilities [Line Items]
Acquisition date																		Mar. 09, 2012	Mar. 09, 2012			Jul. 31, 2012		Sep. 12, 2012				Mar. 29, 2013				Aug. 20, 2013
Acquisition of issued and outstanding capital stock (in hundredths)																		100.00%	100.00%			100.00%		100.00%				100.00%				100.00%
Cash paid in exchange of net assets acquired																		$ 2,700,000	€ 1,700,000			$ 13,700,000	€ 8,700,000	$ 3,000,000				$ 21,000,000	$ 22,400,000	$ 6,948,000	$ 29,348,000	$ 9,960,000	$ 45,000	$ 10,005,000	$ 39,353,000			$ 22,138,000	$ 263,000	$ 22,401,000
Cash acquired from acquisition			8,359,000	2,991,000	0																	2,700,000		200,000
Number of restricted shares granted for acquisition (in shares)																									30,000
Compensation expense of grant date fair value of restricted shares																									600,000
Acquisition-related costs	500,000	700,000																																		200,000	800,000				700,000	500,000
Acquisition-related costs excluded from pro forma net earnings			900,000
Acquisition-related costs incurred but excluded from pro forma earnings during the period after tax			600,000
Nonrecurring expense related to fair value adjustments excluded from pro forma net earnings			400,000
Fair value adjustments excluded from pro form net earnings after tax			400,000
Research and development expense incurred			14,100,000	12,400,000	12,000,000															1,000,000	600,000
Assets acquired [Abstract]
Cash and cash equivalents																													8,388,000	(29,000)	8,359,000	0	0	0	8,359,000			2,991,000	0	2,991,000
Accounts receivable																													11,580,000	(39,000)	11,541,000	994,000	0	994,000	12,535,000			3,750,000	3,000	3,753,000
Inventories																													6,258,000	1,097,000	7,355,000	2,588,000	(1,595,000)	993,000	8,348,000			1,061,000	(16,000)	1,045,000
Other current assets																													1,953,000	(181,000)	1,772,000	83,000	345,000	428,000	2,200,000			90,000	0	90,000
Property, plant and equipment																													4,693,000	1,097,000	5,790,000	2,285,000	1,225,000	3,510,000	9,300,000			502,000	263,000	765,000
Intangible assets																													0	6,110,000	6,110,000	0	1,470,000	1,470,000	7,580,000			30,000	11,626,000	11,656,000
Other assets																													1,151,000	84,000	1,235,000	84,000	1,663,000	1,747,000	2,982,000
Total identifiable assets																													34,023,000	8,139,000	42,162,000	6,034,000	3,108,000	9,142,000	51,304,000			8,424,000	11,876,000	20,300,000
Liabilities assumed [Abstract]
Accounts payable																													(8,565,000)	331,000	(8,234,000)	(677,000)	1,000	(676,000)	(8,910,000)			(1,702,000)	0	(1,702,000)
Accrued expenses																													(4,003,000)	(219,000)	(4,222,000)	(206,000)	(79,000)	(285,000)	(4,507,000)			(1,736,000)	0	(1,736,000)
Other current liabilities																													(25,000)	(791,000)	(816,000)	(214,000)	214,000	0	(816,000)
Noncurrent liabilities																													0	(586,000)	(586,000)	(643,000)	(1,105,000)	(1,748,000)	(2,334,000)
Notes Payable																																						(216,000)	0	(216,000)
Income taxes payable																																						(264,000)	(60,000)	(324,000)
Deferred income tax liability, current																																						(70,000)	0	(70,000)
Deferred income tax liability, noncurrent																																						0	(2,700,000)	(2,700,000)
Other long-term liabilities																																						(216,000)	0	(216,000)
Total liabilities assumed																													(12,593,000)	(1,265,000)	(13,858,000)	(1,740,000)	(969,000)	(2,709,000)	(16,567,000)			(4,204,000)	(2,760,000)	(6,964,000)
Net identifiable assets acquired																													21,430,000	6,874,000	28,304,000	4,294,000	2,139,000	6,433,000	34,737,000			4,220,000	9,116,000	13,336,000
Goodwill																													8,278,000	(7,234,000)	1,044,000	5,666,000	(2,094,000)	3,572,000	4,616,000			17,965,000	(8,900,000)	9,065,000
Fair value of net assets acquired																													29,708,000	(360,000)	29,348,000	9,960,000	45,000	10,005,000	39,353,000			22,185,000	216,000	22,401,000
Consideration transferred [Abstract]
Cash Paid																		2,700,000	1,700,000			13,700,000	8,700,000	3,000,000				21,000,000	22,400,000	6,948,000	29,348,000	9,960,000	45,000	10,005,000	39,353,000			22,138,000	263,000	22,401,000
Assumption of severance payment																													109,000	(109,000)	0	0	0	0	0
Fair value of consideration transferred																													22,509,000	6,839,000	29,348,000	9,960,000	45,000	10,005,000	39,353,000			22,185,000	216,000	22,401,000
Deferred consideration																													7,199,000	(7,199,000)	0	0	0	0	0			47,000	(47,000)	0
Total consideration paid/payable																													29,708,000	(360,000)	29,348,000	9,960,000	45,000	10,005,000	39,353,000
Unaudited Pro forma Consolidated Results of Operations
Revenue			374,153,000	376,921,000																						10,700,000	3,100,000									68,600,000
Net earnings			17,774,000	8,800,000																						1,000,000	200,000									9,200,000
Earnings per common share - basic and diluted (in dollars per share)														$ 1.48	$ 0.69	$ 1.58	$ 0.76
Fair Value of Identifiable Intangible Assets [Abstract]
Acquisition date fair value						40,000	1,264,000
Acquisition date fair value								1,540,000	6,542,000	5,840,000	3,292,000	160,000	558,000
Weighted average life								22 years	20 years	17 years 6 months	16 years	2 years	2 years
Total identifiable intangible assets acquired			$ 7,580,000	$ 11,656,000