SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2012

Accounting Policies [Abstract]

Available-for-sale Securities [Table Text Block]

Amortized cost and estimated fair market value of investments classified as available-for-sale at March 31, 2012, are as follows(in thousands):

			Gross Unrealized
	Amortized Cost		Gains		Losses		Estimated Fair Market Value
Investments due in less than 3 months:
Commercial paper	$	16,672	$	2	$	—	$	16,674
Corporate securities	6,439		30		—		6,469
Total	$	23,111	$	32	$	—	$	23,143
Investments due in 4-12 months:
Corporate securities	$	19,694	$	141	$	—	$	19,835
Certificates of deposit	10,000		1		—		10,001
Total	$	29,694	$	142	$	—	$	29,836
Investments due in more than 12 months:
Corporate securities	$	30,433	$	117	$	—	$	30,550
Total	$	30,433	$	117	$	—	$	30,550
Total investment securities	$	83,238	$	291	$	—	$	83,529

Held-to-maturity Securities [Table Text Block]

Amortized cost and estimated fair market value of investments classified as held-to-maturity at December 31, 2011 are as follows(in thousands):

			Gross Unrealized
	Amortized Cost		Gains		Losses			Estimated Fair Market Value
Investments due in less than 3 months:
Commercial paper	$	9,849	$	—	$	—		$	9,849
Corporate securities	6,098		9		(1		)	6,106
Total	$	15,947	$	9	$	(1	)	$	15,955
Investments due in 4-12 months:
Corporate securities	$	24,801	$	179	$	(23	)	$	24,957
Certificates of deposit	10,000		1		—			10,001
Total	$	34,801	$	180	$	(23	)	$	34,958
Investments due in more than 12 months:
Corporate securities	$	32,041	$	5	$	(178	)	$	31,868
Total	$	32,041	$	5	$	(178	)	$	31,868
Total investment securities	$	82,789	$	194	$	(202	)	$	82,781

Schedule of Accounts Receivable [Table Text Block]

Accounts Receivable (in thousands):

	March 31, 2012			December 31, 2011
Accounts receivable trade	$	39,311		$	27,972
Accrued ship and debit and rebate claims	(22,399		)	(18,361		)
Allowance for doubtful accounts	(216		)	(215		)
Total	$	16,696		$	9,396

Schedule of Prepaid Expenses and Other Current Assets [Table Text Block]

Prepaid Expenses and Other Current Assets (in thousands):

	March 31, 2012		December 31, 2011
Prepaid legal fees	$	2,625	$	3,500
Prepaid income tax	148		118
Prepaid maintenance agreements	540		669
Interest receivable	570		625
Other	2,339		2,156
Total	$	6,222	$	7,068

Schedule of Other Assets, Noncurrent [Table Text Block]

Other Assets (in thousands):

	March 31, 2012		December 31, 2011
Prepaid royalty (Note 15)	$	10,000	$	10,000
Investment in third party (Note 15)	7,000		7,000
Note receivable, net of interest discount (Note 15)	11,965		—
Financing lease receivables and deposits (Note 16)	6,849		7,558
Purchase option (Note 15)	6,216		—
Other	1,694		1,953
Total	$	43,724	$	26,511