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
Net sales:
Product	$ 1,143,000us-gaap_SalesRevenueGoodsNet	$ 1,091,186us-gaap_SalesRevenueGoodsNet	$ 1,054,849us-gaap_SalesRevenueGoodsNet
Software maintenance	100,862us-gaap_MaintenanceRevenue	81,372us-gaap_MaintenanceRevenue	87,494us-gaap_MaintenanceRevenue
GSA accrual			1,349
Total net sales	1,243,862us-gaap_SalesRevenueNet	1,172,558us-gaap_SalesRevenueNet	1,143,692us-gaap_SalesRevenueNet
Cost of sales:
Product	312,623us-gaap_CostOfGoodsSold	299,854us-gaap_CostOfGoodsSold	274,839us-gaap_CostOfGoodsSold
Software maintenance	5,509us-gaap_CostOfServicesMaintenanceCosts	5,389us-gaap_CostOfServicesMaintenanceCosts	5,435us-gaap_CostOfServicesMaintenanceCosts
Total cost of sales	318,132us-gaap_CostOfRevenue	305,243us-gaap_CostOfRevenue	280,274us-gaap_CostOfRevenue
Gross profit	925,730us-gaap_GrossProfit	867,315us-gaap_GrossProfit	863,418us-gaap_GrossProfit
Operating expenses:
Sales and marketing	461,845us-gaap_SellingAndMarketingExpense	447,800us-gaap_SellingAndMarketingExpense	431,468us-gaap_SellingAndMarketingExpense
Research and development	227,433us-gaap_ResearchAndDevelopmentExpense	234,796us-gaap_ResearchAndDevelopmentExpense	222,994us-gaap_ResearchAndDevelopmentExpense
General and administrative	91,265us-gaap_GeneralAndAdministrativeExpense	87,418us-gaap_GeneralAndAdministrativeExpense	85,239us-gaap_GeneralAndAdministrativeExpense
Acquisition related adjustment		(1,316)	6,783
Total operating expenses	780,543us-gaap_OperatingExpenses	768,698us-gaap_OperatingExpenses	746,484us-gaap_OperatingExpenses
Operating income	145,187us-gaap_OperatingIncomeLoss	98,617us-gaap_OperatingIncomeLoss	116,934us-gaap_OperatingIncomeLoss
Other income:
Interest income	1,133us-gaap_InvestmentIncomeInterest	679us-gaap_InvestmentIncomeInterest	716us-gaap_InvestmentIncomeInterest
Net foreign exchange loss	(2,250)	(2,578)	(2,246)
Other (expense) income, net	(69)us-gaap_OtherNonoperatingIncomeExpense	450us-gaap_OtherNonoperatingIncomeExpense	(567)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	144,001	97,168	114,837
Provision for income taxes	17,668us-gaap_IncomeTaxExpenseBenefit	16,655us-gaap_IncomeTaxExpenseBenefit	24,700us-gaap_IncomeTaxExpenseBenefit
Net income	$ 126,333us-gaap_NetIncomeLoss	$ 80,513us-gaap_NetIncomeLoss	$ 90,137us-gaap_NetIncomeLoss
Basic earnings per share	$ 0.99us-gaap_EarningsPerShareBasic	$ 0.65us-gaap_EarningsPerShareBasic	$ 0.74us-gaap_EarningsPerShareBasic
Weighted average shares outstanding - basic	127,030	124,558	121,973
Diluted earnings per share	$ 0.99us-gaap_EarningsPerShareDiluted	$ 0.64us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding - diluted	127,799	125,571	122,977
Dividends declared per share	$ 0.60	$ 0.56	$ 0.56

The current period charge to decrease/increase our contingent consideration accrual related to out AWR acquisition.

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-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration