Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales
Product Sales	$ 1,930,497us-gaap_SalesRevenueGoodsNet	$ 1,860,893us-gaap_SalesRevenueGoodsNet	$ 1,852,192us-gaap_SalesRevenueGoodsNet
Service Sales	555,486us-gaap_SalesRevenueServicesNet	518,079us-gaap_SalesRevenueServicesNet	489,336us-gaap_SalesRevenueServicesNet
Total Net Sales	2,485,983us-gaap_SalesRevenueNet	2,378,972us-gaap_SalesRevenueNet	2,341,528us-gaap_SalesRevenueNet
Cost of sales
Products Cost of Sales	809,537us-gaap_CostOfGoodsSold	795,225us-gaap_CostOfGoodsSold	811,204us-gaap_CostOfGoodsSold
Service Cost of Sales	317,696us-gaap_CostOfServices	301,816us-gaap_CostOfServices	289,269us-gaap_CostOfServices
Gross profit	1,358,750us-gaap_GrossProfit	1,281,931us-gaap_GrossProfit	1,241,055us-gaap_GrossProfit
Research and development	123,297us-gaap_ResearchAndDevelopmentExpense	116,346us-gaap_ResearchAndDevelopmentExpense	112,530us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	728,582	692,693	684,026
Amortization	29,185us-gaap_AmortizationOfDeferredCharges	24,539us-gaap_AmortizationOfDeferredCharges	21,357us-gaap_AmortizationOfDeferredCharges
Interest Expense	24,537us-gaap_InterestExpense	22,711us-gaap_InterestExpense	22,764us-gaap_InterestExpense
Restructuring Charges	5,915us-gaap_RestructuringCharges	19,830us-gaap_RestructuringCharges	16,687us-gaap_RestructuringCharges
Other Charges (Income), Net	2,230us-gaap_OtherNonoperatingIncomeExpense	3,103us-gaap_OtherNonoperatingIncomeExpense	1,090us-gaap_OtherNonoperatingIncomeExpense
Earnings Before Taxes	445,004	402,709	382,601
Provision for taxes	106,763us-gaap_IncomeTaxExpenseBenefit	96,615us-gaap_IncomeTaxExpenseBenefit	91,754us-gaap_IncomeTaxExpenseBenefit
Net earnings	$ 338,241us-gaap_NetIncomeLoss	$ 306,094us-gaap_NetIncomeLoss	$ 290,847us-gaap_NetIncomeLoss
Basic earnings per common share:
Net earnings	$ 11.71us-gaap_EarningsPerShareBasic	$ 10.22us-gaap_EarningsPerShareBasic	$ 9.37us-gaap_EarningsPerShareBasic
Weighted average number of common shares	28,890,771	29,945,954	31,044,532
Diluted earnings per common share:
Net earnings	$ 11.44us-gaap_EarningsPerShareDiluted	$ 9.96us-gaap_EarningsPerShareDiluted	$ 9.14us-gaap_EarningsPerShareDiluted
Weighted average number of common and common equivalent shares	29,571,308	30,728,482	31,824,077

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