Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements of Operations
Net sales	$ 98,341us-gaap_SalesRevenueNet	$ 90,841us-gaap_SalesRevenueNet
Cost of sales	63,205us-gaap_CostOfGoodsAndServicesSold	57,064us-gaap_CostOfGoodsAndServicesSold
Gross profit	35,136us-gaap_GrossProfit	33,777us-gaap_GrossProfit
Operating expenses, net:
Selling, general, and administrative	22,882	21,667
Research and development	18,585us-gaap_ResearchAndDevelopmentExpense	19,768us-gaap_ResearchAndDevelopmentExpense
Amortization of intangible assets	7,962us-gaap_AmortizationOfIntangibleAssets	2,903us-gaap_AmortizationOfIntangibleAssets
Restructuring	2,357us-gaap_RestructuringCharges	392us-gaap_RestructuringCharges
Asset impairment	126us-gaap_AssetImpairmentCharges
Changes in contingent consideration		(29,368)
Other, net	(951)us-gaap_OtherOperatingIncomeExpenseNet	(212)us-gaap_OtherOperatingIncomeExpenseNet
Total operating expenses, net	50,961us-gaap_OperatingExpenses	15,150us-gaap_OperatingExpenses
Operating income (loss)	(15,825)us-gaap_OperatingIncomeLoss	18,627us-gaap_OperatingIncomeLoss
Interest income	287us-gaap_InvestmentIncomeInterest	206us-gaap_InvestmentIncomeInterest
Interest expense	(126)us-gaap_InterestExpense	(42)us-gaap_InterestExpense
Income (loss) before income taxes	(15,664)	18,791
Income tax expense (benefit)	3,446us-gaap_IncomeTaxExpenseBenefit	(369)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ (19,110)	$ 19,160
Income (loss) per common share:
Basic (in dollars per share)	$ (0.48)us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (0.48)us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic (in shares)	39,639	39,177
Diluted (in shares)	39,639	39,937

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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