COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Tables)

12 Months Ended

Dec. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Schedule of Accounts Receivable [Table Text Block]

Accounts Receivable



(in thousands)	December 31, 2019			December 31, 2018
Accounts receivable trade	$	61,036		$	54,055
Accrued ship and debit	(33,475		)	(40,118		)
Allowance for stock rotation and rebate	(2,524		)	(2,159		)
Allowance for doubtful accounts	(763		)	(706		)
Total	$	24,274		$	11,072

Schedule of Inventory, Current [Table Text Block]

Inventories



(in thousands)	December 31, 2019		December 31, 2018
Raw materials	$	39,058	$	41,138
Work-in-process	25,982		15,612
Finished goods	25,340		24,107
Total	$	90,380	$	80,857

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

Prepaid Expenses and Other Current Assets



(in thousands)	December 31, 2019		December 31, 2018
Prepaid income tax	$	5,615	$	3,081
Prepaid legal fees	16		181
Prepaid maintenance agreements	819		2,047
Advance to suppliers	3,579		2,157
Interest receivable	1,279		595
Other	4,289		3,854
Total	$	15,597	$	11,915

Property and Equipment [Table Text Block]

Property and Equipment



(in thousands)	December 31, 2019			December 31, 2018
Land	$	21,790		$	20,288
Construction-in-progress	18,604			21,696
Building and improvements	55,785			53,610
Machinery and equipment	168,576			160,028
Computer software and hardware and office furniture and fixtures	52,265			53,681
	317,020			309,303
Accumulated depreciation	(200,401		)	(195,186		)
Total	$	116,619		$	114,117

Property and Equipment Useful Lives [Table Text Block]



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 loss for the three years ended December 31, 2019:



(in thousands)	Unrealized Gains and Losses on Available-for-Sale Securities			Defined Benefit Pension Items				Foreign Currency Items			Total
Balance at January 1, 2017	$	(220	)	$	(1,936	)		$	(554	)	$	(2,710	)
Other comprehensive income (loss) before reclassifications	(207		)	502				79			374
Amounts reclassified from accumulated other comprehensive loss	—			197			⁽¹⁾	—			197
Other comprehensive income	(207		)	699				79			571
Balance at December 31, 2017	(427		)	(1,237		)		(475		)	(2,139		)
Other comprehensive income (loss) before reclassifications	161			401				(236		)	326
Amounts reclassified from accumulated other comprehensive loss	—			124			⁽¹⁾	—			124
Other comprehensive income	161			525				(236		)	450
Balance at December 31, 2018	(266		)	(712		)		(711		)	(1,689		)
Other comprehensive income (loss) before reclassifications	849			(1,839		)		(518		)	(1,508		)
Amounts reclassified from accumulated other comprehensive loss	—			67			⁽¹⁾	—			67
Other comprehensive loss	849			(1,772		)		(518		)	(1,441		)
Balance at December 31, 2019	$	583		$	(2,484	)		$	(1,229	)	$	(3,130	)

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(1)

This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years ended December 31, 2019, 2018 and 2017.