INCOME STATEMENTS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues	$ 90,424	$ 82,408
Cost of Goods and Services Sold	40,078	36,601
Gross margin	50,346	45,807
Research and development	11,918	15,048
Selling, General and Administrative Expense	33,935	31,491
Amortization of Intangible Assets	2,852	2,852
Operating Expenses	48,705	49,391
Operating income	1,641	(3,584)
Other income, net	1	60
Income (Loss) Attributable to Parent, before Tax	1,028	(3,524)
Provision for income taxes	(374)	6,484
Net Income (Loss) Attributable to Parent	654	2,960
Net Income (Loss) Available to Common Stockholders, Basic	634	2,904
Net Income (Loss) Available to Common Stockholders, Diluted	$ 633	$ 2,904
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 0.01	$ 0.07
Earnings Per Share, Diluted	$ 0.01	$ 0.07
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted Average Number of Shares Outstanding, Basic	44,404	43,949
Weighted Average Number of Shares Outstanding, Diluted	45,038	44,546
Common Stock, Dividends, Per Share, Declared	$ 0.09	$ 0.06
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (63)	$ (133)
Other Comprehensive Income (Loss), Net of Tax	(63)	(133)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	591	2,827
Income (Loss) from Equity Method Investments	$ (614)	$ 0