Consolidated Condensed Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 177,940us-gaap_SalesRevenueNet	$ 181,941us-gaap_SalesRevenueNet
Cost of sales	85,658us-gaap_CostOfGoodsAndServicesSold	79,359us-gaap_CostOfGoodsAndServicesSold
Gross profit	92,282us-gaap_GrossProfit	102,582us-gaap_GrossProfit
Selling and administrative expense	74,786	78,364
Research and development expense	6,542us-gaap_ResearchAndDevelopmentExpense	6,910us-gaap_ResearchAndDevelopmentExpense
Total operating expenses	81,328us-gaap_OperatingExpenses	85,274us-gaap_OperatingExpenses
Income from operations	10,954us-gaap_OperatingIncomeLoss	17,308us-gaap_OperatingIncomeLoss
Interest expense	1,460us-gaap_InterestExpense	1,461us-gaap_InterestExpense
Income before income taxes	9,494	15,847
Provision for income taxes	3,182us-gaap_IncomeTaxExpenseBenefit	7,221us-gaap_IncomeTaxExpenseBenefit
Net income	6,312us-gaap_NetIncomeLoss	8,626us-gaap_NetIncomeLoss
Comprehensive income (loss)	$ (3,715)us-gaap_ComprehensiveIncomeNetOfTax	$ 9,577us-gaap_ComprehensiveIncomeNetOfTax
Per share data:
Basic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic
Diluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted
Dividends per share of common stock	$ 0.20	$ 0.20
Weighted average common shares:
Basic (shares)	27,573	27,349
Diluted (shares)	27,820	27,854

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770