SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Raw materials	$ 8,221,000				$ 10,564,000				$ 8,221,000	$ 10,564,000
Work-in-process	13,216,000				12,122,000				13,216,000	12,122,000
Finished goods	20,798,000				21,939,000				20,798,000	21,939,000
Total	42,235,000				44,625,000				42,235,000	44,625,000
Accounts Receivable [Abstract]
Accounts receivable trade	42,410,000				33,866,000				42,410,000	33,866,000
Accrued ship and debit and rebate claims	(29,901,000)				(26,293,000)				(29,901,000)	(26,293,000)
Allowance for doubtful accounts	(120,000)				(247,000)				(120,000)	(247,000)
Total	12,389,000				7,326,000				12,389,000	7,326,000
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid legal fees	6,267,000				1,760,000				6,267,000	1,760,000
Advance to supplier	757,000				1,170,000				757,000	1,170,000
Prepaid income tax	7,521,000				11,463,000				7,521,000	11,463,000
Prepaid maintenance agreements	947,000				616,000				947,000	616,000
Interest receivable	519,000				149,000				519,000	149,000
Other	2,621,000				2,243,000				2,621,000	2,243,000
Total	18,632,000				17,401,000				18,632,000	17,401,000
Other Assets [Abstract]
Total	3,476,000				4,673,000				3,476,000	4,673,000
Employee Benefits Plan [Abstract]
Discretionary company contribution to 401(k)									1,100,000	0	0
Concentration Risk [Line Items]
Payments of dividends	2,400,000	2,400,000	2,300,000	2,300,000	1,400,000	1,400,000	1,400,000	1,400,000	9,446,000	5,755,000	5,722,000
Deferred Revenue [Abstract]
Sell-through deferred revenue	25,500,000				20,700,000				25,500,000	20,700,000
Sell-through deferred cost	9,800,000				9,100,000				9,800,000	9,100,000
Foreign Exchange Transactions [Abstract]
Foreign exchange transaction losses									(100,000)	(600,000)
Foreign exchange transaction gain											50,000
Warranty [Abstract]
Product warranty period									12 months
Advertising [Abstract]
Advertising costs									$ 1,400,000	$ 1,100,000	$ 1,000,000
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Distributors [Member]
Deferred Revenue [Abstract]
Concentration risk percentage									75.00%