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Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Sales $ 1,033,345us-gaap_SalesRevenueGoodsNet $ 888,346us-gaap_SalesRevenueGoodsNet
Cost of sales 739,614us-gaap_CostOfGoodsSold 629,929us-gaap_CostOfGoodsSold
Gross profit 293,731us-gaap_GrossProfit 258,417us-gaap_GrossProfit
Operating expenses:    
Selling and marketing 69,685us-gaap_SellingAndMarketingExpense 65,570us-gaap_SellingAndMarketingExpense
Research and development 38,863us-gaap_ResearchAndDevelopmentExpense 35,513us-gaap_ResearchAndDevelopmentExpense
General and administrative 49,539us-gaap_GeneralAndAdministrativeExpense 41,292us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 158,087us-gaap_OperatingExpenses 142,375us-gaap_OperatingExpenses
Income from financial services 14,642us-gaap_FinancialServicesRevenue 10,640us-gaap_FinancialServicesRevenue
Operating income 150,286us-gaap_OperatingIncomeLoss 126,682us-gaap_OperatingIncomeLoss
Non-operating expense (income):    
Interest expense 2,910us-gaap_InterestExpense 2,812us-gaap_InterestExpense
Equity in loss of other affiliates 1,623us-gaap_IncomeLossFromEquityMethodInvestments 896us-gaap_IncomeLossFromEquityMethodInvestments
Other expense (income), net 7,440us-gaap_OtherNonoperatingIncomeExpense (2,105)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes 138,313us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 125,079us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 49,750us-gaap_IncomeTaxExpenseBenefit 44,178us-gaap_IncomeTaxExpenseBenefit
Net income $ 88,563us-gaap_NetIncomeLoss $ 80,901us-gaap_NetIncomeLoss
Basic net income per share (in dollars per share) $ 1.33us-gaap_EarningsPerShareBasic $ 1.23us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share) $ 1.30us-gaap_EarningsPerShareDiluted $ 1.19us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:    
Basic (in shares) 66,429us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 65,833us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 68,146us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 67,958us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding