Statements of Income Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues	$ 62,701	$ 59,466	$ 117,063	$ 112,036
Cost of Revenue	28,508	27,582	53,825	51,186
Gross Profit	34,193	31,884	63,238	60,850
Operating Expenses [Abstract]
Research and Development Expense	11,879	10,507	24,325	20,867
Selling, General and Administrative Expense	9,488	11,033	18,987	24,007
Gain (Loss) Related to Litigation Settlement	0	0	(14,632)	0
Amortization of Intangible Assets	595	515	1,190	1,030
Operating Expenses	21,962	22,055	29,870	45,904
Operating Income (Loss)	12,231	9,829	33,368	14,946
Interest Expense, net	1,446	1,385	2,915	2,767
Total other expenses (income)	192	(212)	299	426
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	10,593	8,656	30,154	11,753
Income Tax Expense (Benefit)	2,992	2,629	8,614	3,878
Net Income (Loss) Attributable to Parent	$ 7,601	$ 6,027	$ 21,540	$ 7,875
Earnings (Loss) Per Share, Basic	$ 0.25	$ 0.19	$ 0.70	$ 0.25
Earnings (Loss) Per Share, Diluted	$ 0.24	$ 0.19	$ 0.68	$ 0.24
Weighted Average Number of Shares Outstanding, Basic	30,779	31,663	30,869	31,724
Weighted Average Number of Shares Outstanding, Diluted	31,754	32,339	31,705	32,373