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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net sales    
Product sales $ 445,687us-gaap_SalesRevenueGoodsNet $ 436,227us-gaap_SalesRevenueGoodsNet
Service sales 100,512us-gaap_SalesRevenueServicesNet 106,732us-gaap_SalesRevenueServicesNet
Total net sales 546,199us-gaap_SalesRevenueNet 542,959us-gaap_SalesRevenueNet
Cost of sales    
Cost of product sales 293,009us-gaap_CostOfGoodsSold 288,934us-gaap_CostOfGoodsSold
Cost of service sales 62,094us-gaap_CostOfServices 69,411us-gaap_CostOfServices
Total cost of sales 355,103us-gaap_CostOfRevenue 358,345us-gaap_CostOfRevenue
Gross profit 191,096us-gaap_GrossProfit 184,614us-gaap_GrossProfit
Research and development expenses (15,262)us-gaap_ResearchAndDevelopmentExpense (16,877)us-gaap_ResearchAndDevelopmentExpense
Selling expenses (31,088)us-gaap_SellingExpense (32,631)us-gaap_SellingExpense
General and administrative expenses (71,911)us-gaap_GeneralAndAdministrativeExpense (74,072)us-gaap_GeneralAndAdministrativeExpense
Operating income 72,835us-gaap_OperatingIncomeLoss 61,034us-gaap_OperatingIncomeLoss
Interest expense (8,996)us-gaap_InterestExpense (9,055)us-gaap_InterestExpense
Other income, net 481us-gaap_OtherNonoperatingIncomeExpense 112us-gaap_OtherNonoperatingIncomeExpense
Earnings before income taxes 64,320us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 52,091us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes (21,097)us-gaap_IncomeTaxExpenseBenefit (15,661)us-gaap_IncomeTaxExpenseBenefit
Earnings from continuing operations 43,223us-gaap_IncomeLossFromContinuingOperations 36,430us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations, net of taxes (27,232)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (1,266)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net earnings $ 15,991us-gaap_NetIncomeLoss $ 35,164us-gaap_NetIncomeLoss
Earnings Per Share, Basic [Abstract]    
Earnings from continuing operations $ 0.91us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.76us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Loss from discontinued operations $ (0.57)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic earnings per share (usd per share) $ 0.34us-gaap_EarningsPerShareBasic $ 0.73us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted [Abstract]    
Earnings from continuing operations $ 0.89us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.74us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Loss from discontinued operations $ (0.56)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted earnings per share (usd per share) $ 0.33us-gaap_EarningsPerShareDiluted $ 0.72us-gaap_EarningsPerShareDiluted
Dividends per share $ 0.13us-gaap_CommonStockDividendsPerShareDeclared $ 0.13us-gaap_CommonStockDividendsPerShareDeclared
Weighted average shares outstanding:    
Basic (shares) 47,724us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 47,982us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (shares) 48,732us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 49,130us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding