INCOME TAXES (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Liability for uncertain tax position that would impact effective tax rate		$ 2,700,000	$ 4,100,000
Liabilities for uncertain tax positions included in income tax payable		600,000	0
Liability for uncertain tax positions		2,100,000	4,100,000
Years tax audit notified by IRS		December 31, 2004 through 2009
IRS audit settlement		100,000
Prior year liability uncertain tax positions relating to 2007		600,000
Increase in the liability for uncertain tax positions		1,221,000	297,000	948,000
Reconciliation of beginning and ending amount of liability for uncertain tax positions [Roll Forward]
Liability for uncertain tax positions - January 1	2,711,000	4,132,000	3,835,000	4,722,000
Additions based on tax positions related to the current year		1,221,000	297,000	948,000
Expiration of statutes of limitations		(2,642,000)	0	(1,835,000)
Liability for uncertain tax positions - December 31		2,711,000	4,132,000	3,835,000
Interest and penalties uncertain tax positions recognized		(500,000)	200,000	200,000
Accrued interest and penalties uncertain tax positions		200,000	700,000
Earnings (loss) before provision (benefit) for income taxes included earnings from domestic operations		400,000	9,600,000	3,600,000
Earnings (loss) from foreign operations		600,000	(1,700,000)	12,000,000
Current [Abstract]
Federal		(459,000)	2,585,000	221,000
Foreign		241,000	478,000	803,000
State		76,000	362,000	182,000
Total		(142,000)	3,425,000	1,206,000
Deferred [Abstract]
Federal		(807,000)	599,000	(133,000)
State		(58,000)	102,000	189,000
Foreign		(357,000)	(18,000)	669,000
Total		(1,222,000)	683,000	725,000
Tax provision (benefit) computed at the Company's effective tax rate		(1,364,000)	4,108,000	1,931,000
Reconciliation of taxes on income computed at the federal statutory rate [Abstract]
Tax provision (benefit) computed at the federal statutory		353,000	2,676,000	5,297,000
Increase (decrease) in taxes resulting from [Abstract]
Different tax rates and permanent differences applicable to foreign operations		(306,000)	1,526,000	(2,377,000)
Increase in (reversal of) liability for uncertain tax positions - net		(1,421,000)	297,000	(887,000)
Utilization of research and development and foreign tax credits		0	(762,000)	(549,000)
State taxes, net of federal benefit		0	341,000	309,000
Current year valuation allowance - U.S. segment		298,000	0	0
Permanent differences applicable to U.S. operations including qualified production activity credits, SERP/COLI income, unrealized exchange gains and amortization of purchase accounting intangibles		(260,000)	44,000	(73,000)
Other		(28,000)	(14,000)	211,000
Tax provision (benefit) computed at the Company's effective tax rate		(1,364,000)	4,108,000	1,931,000
Increase (decrease) in effective tax rate resulting from [Abstract]
Tax provision (benefit) computed at the federal statutory rate (in hundredths)		34.00%	34.00%	34.00%
Different tax rates and permanent differences applicable to foreign operations (in hundredths)		(29.00%)	19.00%	(15.00%)
Increase in (reversal of) liability for uncertain tax positions - net (in hundredths)		(137.00%)	4.00%	(6.00%)
Utilization of research and development and foreign tax credits (in hundredths)		0.00%	(10.00%)	(4.00%)
State taxes, net of federal benefit (in hundredths)		0.00%	4.00%	2.00%
Current year valuation allowance - U.S. segment (in hundredths)		29.00%	0.00%	0.00%
Permanent differences applicable to U.S. operations including qualified production activity credits, SERP/COLI income, unrealized exchange gains and amortization of purchase accounting intangibles (in hundredths)		(25.00%)	1.00%	0.00%
Other (in hundredths)		(3.00%)	0.00%	1.00%
Tax provision (benefit) computed at the Company's effective tax rate (in hundredths)		(131.00%)	52.00%	12.00%
Tax credit carryforward, valuation allowance		700,000
Liability for uncertain tax positions		2,161,000	4,132,000
Unrepatriated foreign earnings		93,700,000
Estimated federal income tax liability related to unrepatriated foreign earnings		20,900,000
Repatriated earnings			500,000
Decrease in the income tax benefit		400,000
Amount of R&E tax credit	400,000
Deferred Tax Assets - current [Abstract]
State tax credits		845,000	766,000
Reserves and accruals		1,334,000	1,195,000
Valuation allowance		(745,000)	(666,000)
Deferred income tax assets - current		1,434,000	1,295,000
Deferred Tax Assets - noncurrent [Abstract]
Unfunded pension liability		1,150,000	941,000
Depreciation		(426,000)	(369,000)
Amortization		(2,063,000)	243,000
Federal, state and foreign net operating loss and credit carryforwards		1,114,000	566,000
Restructuring expenses		319,000	0
Other accruals		2,438,000	1,999,000
Valuation allowances		(1,129,000)	(566,000)
Deferred income tax assets - noncurrent		1,403,000	2,814,000
Macao corporate profit tax rate (in hundredths)		12.00%
Fibreco and Gigacom [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Liability for uncertain tax positions		2,300,000
Fibreco [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax liability		100,000
Deferred tax liabilities at the date of acquisition		1,700,000
GigaCom [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Deferred tax liabilities at the date of acquisition		600,000
Germany [Member]
Income Taxes [Line Items]
Income tax audit, years under examination		2008 through 2010
U.S. Federal [Member]
Income Taxes [Line Items]
Years not subject to examination by tax authorities		before 2010
State Jurisdiction [Member]
Income Taxes [Line Items]
Years not subject to examination by tax authorities		before 2007
Increase (decrease) in effective tax rate resulting from [Abstract]
Operating loss carryforwards		1,700,000
Operating loss carryforwards, valuation allowance		200,000
Capital loss carryforwards		2,700,000
Capital loss carryforward, valuation allowance		400,000
Tax credit carryforward		1,200,000
Foreign Jurisdictions [Member]
Increase (decrease) in effective tax rate resulting from [Abstract]
Operating loss carryforwards		3,400,000
Operating loss carryforwards, valuation allowance		500,000
Capital loss carryforwards		200,000
Capital loss carryforward, valuation allowance		$ 100,000
Foreign Jurisdictions [Member] | Asia [Member]
Income Taxes [Line Items]
Years not subject to examination by tax authorities		before 2004
Foreign Jurisdictions [Member] | Europe [Member]
Income Taxes [Line Items]
Years not subject to examination by tax authorities		before 2006