SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Dividends Declared [Table Text Block]

	Year Ended December 31,
	2016		2015		2014
First Quarter	$	0.13	$	0.12	$	0.10
Second Quarter	$	0.13	$	0.12	$	0.10
Third Quarter	$	0.13	$	0.12	$	0.12
Fourth Quarter	$	0.13	$	0.12	$	0.12

Available-for-sale Securities [Table Text Block]

Amortized cost and estimated fair market value of investments classified as available-for-sale (excluding cash equivalents) at December 31, 2016, were as follows:

	Amortized		Gross Unrealized					Estimated Fair
(in thousands)	Cost		Gains		Losses			Market Value
Investments due in less than 3 months:
Commercial paper	$	36,996	$	—	$	—		$	36,996
Corporate securities	9,342		2		(2		)	9,342
Total	46,338		2		(2		)	46,338
Investments due in 4-12 months:
Commercial paper	19,186		—		—			19,186
Corporate securities	59,714		15		(76		)	59,653
Total	78,900		15		(76		)	78,839
Investments due 12 months or greater:
Corporate securities	63,305		21		(180		)	63,146
Total	63,305		21		(180		)	63,146
Total investment securities	$	188,543	$	38	$	(258	)	$	188,323

Amortized cost and estimated fair market value of investments classified as available-for-sale (excluding cash equivalents) at December 31, 2015, were as follows:

	Amortized		Gross Unrealized					Estimated Fair
(in thousands)	Cost		Gains		Losses			Market Value
Investments due in less than 3 months:
Corporate securities	$	38,586	$	7	$	(10	)	$	38,583
Total	38,586		7		(10		)	38,583
Investments due in 4-12 months:
Corporate securities	33,654		1		(36		)	33,619
Total	33,654		1		(36		)	33,619
Investments due between 12 months or greater:
Corporate securities	11,626		—		(59		)	11,567
Total	11,626		—		(59		)	11,567
Total investment securities	$	83,866	$	8	$	(105	)	$	83,769

Schedule of Inventories [Table Text Block]

Inventories consist of the following:

(in thousands)	December 31, 2016		December 31, 2015
Raw materials	$	14,610	$	19,090
Work-in-process	15,194		12,770
Finished goods	22,760		20,074
Total	$	52,564	$	51,934

Schedule of Accounts Receivable [Table Text Block]

Accounts receivable:

(in thousands)	December 31, 2016			December 31, 2015
Accounts receivable trade	$	46,849		$	43,622
Accrued ship and debit and rebate claims	(39,363		)	(35,486		)
Allowance for doubtful accounts	(525		)	(318		)
Total	$	6,961		$	7,818

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

Prepaid expenses and other current assets:

(in thousands)	December 31, 2016		December 31, 2015
Prepaid legal fees	$	212	$	2,023
Advance to suppliers	69		324
Prepaid income tax	2,431		309
Prepaid maintenance agreements	1,399		736
Interest receivable	743		519
Other	3,666		2,879
Total	$	8,520	$	6,790

Schedule of Property and Equipment [Table Text Block]

Property and equipment consist of the following:

(in thousands)	December 31, 2016			December 31, 2015
Land	$	20,288		$	20,288
Construction-in-progress	6,880			2,298
Building and improvements	52,156			51,941
Machinery and equipment	132,162			128,342
Computer software and hardware and office furniture and fixtures	45,951			43,383
	257,437			246,252
Accumulated depreciation	(162,141		)	(146,871		)
Total	$	95,296		$	99,381

Building and improvements	4-40 years
Machinery and equipment	2-8 years
Computer software and hardware and office furniture and fixtures	4-7 years

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

Changes in accumulated other comprehensive income (loss) for the three years ended December 31, 2016:

(in thousands)	Unrealized Gains and Losses on Available-for-Sale Securities			Defined Benefit Pension Items				Foreign Currency Items			Total
Balance at January 1, 2014	$	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		)
Other comprehensive income (loss) before reclassifications	(180		)	(469		)		(191		)	(840		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			125			(1)	—			125
Other comprehensive loss	(180		)	(344		)		(191		)	(715		)
Balance at December 31, 2015	(97		)	(1,584		)		(170		)	(1,851		)
Other comprehensive income (loss) before reclassifications	(123		)	(505		)		(384		)	(1,012		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			153			(1)	—			153
Other comprehensive loss	(123		)	(352		)		(384		)	(859		)
Balance at December 31, 2016	$	(220	)	$	(1,936	)		$	(554	)	$	(2,710	)

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