SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2014

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 December 31, 2014, were as follows(in thousands):

			Gross Unrealized					Estimated Fair
	Amortized Cost		Gains		Losses			Market Value
Investments due in 4-12 months:
Corporate securities	$	30,233	$	36	$	—		$	30,269
Total	30,233		36		—			30,269
Investments due between 12 months and 5-years:
Corporate securities	84,259		92		(45		)	84,306
Total	84,259		92		(45		)	84,306
Total investment securities	$	114,492	$	128	$	(45	)	$	114,575

Amortized cost and estimated fair market value of investments classified as available-for-sale at December 31, 2013, were as follows(in thousands):

			Gross Unrealized					Estimated Fair
	Amortized Cost		Gains		Losses			Market Value
Investments due in less than 3 months:
Commercial paper	$	3,098	$	1	$	—		$	3,099
Total	3,098		1		—			3,099
Investments due in 4-12 months:
Corporate securities	6,007		33		—			6,040
Total	6,007		33		—			6,040
Investments due between 12 months and 5-years:
Corporate securities	102,963		202		(26		)	103,139
Total	102,963		202		(26		)	103,139
Total investment securities	$	112,068	$	236	$	(26	)	$	112,278

Schedule of Inventories [Table Text Block]

Inventories consist of the following (in thousands):

	December 31, 2014		December 31, 2013
Raw materials	$	21,127	$	8,221
Work-in-process	14,643		13,216
Finished goods	28,255		20,798
Total	$	64,025	$	42,235

Schedule of Accounts Receivable [Table Text Block]

Accounts Receivable (in thousands):

	December 31, 2014			December 31, 2013
Accounts receivable trade	$	38,344		$	42,410
Accrued ship and debit and rebate claims	(27,967		)	(29,901		)
Allowance for doubtful accounts	(191		)	(120		)
Total	$	10,186		$	12,389

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

Prepaid Expenses and Other Current Assets (in thousands):

	December 31, 2014		December 31, 2013
Prepaid legal fees	$	1,506	$	6,267
Loan to Cambridge Semiconductor (Note 11)	6,600		—
Advance to suppliers	800		757
Prepaid income tax	3,208		7,521
Prepaid maintenance agreements	1,023		947
Interest receivable	664		519
Other	2,578		2,621
Total	$	16,379	$	18,632

Schedule of Property and Equipment [Table Text Block]

Property and equipment consist of the following (in thousands):

	December 31, 2014			December 31, 2013
Land	$	16,754		$	16,754
Construction-in-progress	8,068			8,003
Building and improvements	44,794			43,641
Machinery and equipment	124,138			111,314
Computer software and hardware and office furniture and fixtures	37,867			34,327
	231,621			214,039
Accumulated depreciation	(135,798		)	(123,898		)
Total	$	95,823		$	90,141

Building and improvements	4-40 years
Machinery and equipment	2-8 years
Computer software and hardware and office furniture and fixtures	4-5 years

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Changes in accumulated other comprehensive income (loss) for three years ended December 31, 2014 (in thousands):

	Unrealized Gains and Losses on Available-for-Sale Securities			Defined Benefit Pension Items				Foreign Currency Items			Total
Balance at January 1, 2012	$	—		$	—			$	50		$	50
Other comprehensive income (loss) before reclassifications	138			(560		)		79			(343		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			—				—			—
Other comprehensive income (loss)	138			(560		)		79			(343		)
Balance at December 31, 2012	138			(560		)		129			(293		)
Other comprehensive income (loss) before reclassifications	72			(277		)		(29		)	(234		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			57			(1)	—			57
Other comprehensive income (loss)	72			(220		)		(29		)	(177		)
Balance at December 31, 2013	210			(780		)		100			(470		)
Other comprehensive income (loss) before reclassifications	(127		)	(538		)		(79		)	(744		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			78			(1)	—			78
Other comprehensive income (loss)	(127		)	(460		)		(79		)	(666		)
Balance at December 31, 2014	$	83		$	(1,240	)		$	21		$	(1,136	)

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