Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES:
Net sales	$ 308,770us-gaap_SalesRevenueGoodsNet	$ 313,056us-gaap_SalesRevenueGoodsNet	$ 316,322us-gaap_SalesRevenueGoodsNet
Other	490us-gaap_OtherSalesRevenueNet	660us-gaap_OtherSalesRevenueNet	547us-gaap_OtherSalesRevenueNet
TOTAL REVENUE	309,260us-gaap_Revenues	313,716us-gaap_Revenues	316,869us-gaap_Revenues
COST OF GOODS SOLD	157,859us-gaap_CostOfGoodsSold	158,984us-gaap_CostOfGoodsSold	160,359us-gaap_CostOfGoodsSold
Gross profit	151,401us-gaap_GrossProfit	154,732us-gaap_GrossProfit	156,510us-gaap_GrossProfit
OPERATING EXPENSES:
Selling, general and administrative	88,939	89,006	84,604
Research and development	18,332us-gaap_ResearchAndDevelopmentExpense	12,407us-gaap_ResearchAndDevelopmentExpense	10,630us-gaap_ResearchAndDevelopmentExpense
Restructuring and strategic transaction	5,093	1,370	0
Total operating expenses	112,364us-gaap_OperatingExpenses	102,783us-gaap_OperatingExpenses	95,234us-gaap_OperatingExpenses
Income from operations	39,037us-gaap_OperatingIncomeLoss	51,949us-gaap_OperatingIncomeLoss	61,276us-gaap_OperatingIncomeLoss
OTHER INCOME	755us-gaap_NonoperatingIncomeExpense	765us-gaap_NonoperatingIncomeExpense	563us-gaap_NonoperatingIncomeExpense
Income before income taxes	39,792	52,714	61,839
PROVISION FOR INCOME TAXES	(13,457)us-gaap_IncomeTaxExpenseBenefit	(12,296)us-gaap_IncomeTaxExpenseBenefit	(20,558)us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 26,335us-gaap_NetIncomeLoss	$ 40,418us-gaap_NetIncomeLoss	$ 41,281us-gaap_NetIncomeLoss
NET INCOME PER SHARE
Basic	$ 1.72us-gaap_EarningsPerShareBasic	$ 2.75us-gaap_EarningsPerShareBasic	$ 2.90us-gaap_EarningsPerShareBasic
Diluted	$ 1.68us-gaap_EarningsPerShareDiluted	$ 2.65us-gaap_EarningsPerShareDiluted	$ 2.80us-gaap_EarningsPerShareDiluted
WEIGHTED AVERAGE NUMBER OF SHARES
Basic (in shares)	15,282	14,688	14,223
Diluted (in shares)	15,647	15,274	14,725

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