Statements of Income Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues	$ 54,362	$ 52,570
Cost of Revenue	25,317	23,604
Gross Profit	29,045	28,966
Operating Expenses [Abstract]
Research and Development Expense	12,446	10,360
Selling, General and Administrative Expense	9,499	12,974
Gain (Loss) Related to Litigation Settlement	(14,632)	0
Amortization of Intangible Assets	595	515
Operating Expenses	7,908	23,849
Operating Income (Loss)	21,137	5,117
Interest Expense, net	1,469	1,382
Total other expenses (income)	107	638
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	19,561	3,097
Income Tax Expense (Benefit)	5,622	1,249
Net Income (Loss) Attributable to Parent	$ 13,939	$ 1,848
Earnings (Loss) Per Share, Basic	$ 0.45	$ 0.06
Earnings (Loss) Per Share, Diluted	$ 0.44	$ 0.06
Weighted Average Number of Shares Outstanding, Basic	30,957	31,928
Weighted Average Number of Shares Outstanding, Diluted	31,654	32,549