Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net sales:
Product	$ 261,574us-gaap_SalesRevenueGoodsNet	$ 262,264us-gaap_SalesRevenueGoodsNet
Software maintenance	27,939us-gaap_MaintenanceRevenue	22,410us-gaap_MaintenanceRevenue
Total net sales	289,513us-gaap_SalesRevenueNet	284,674us-gaap_SalesRevenueNet
Cost of sales:
Product	74,881us-gaap_CostOfGoodsSold	69,621us-gaap_CostOfGoodsSold
Software maintenance	1,455us-gaap_CostOfServicesMaintenanceCosts	1,581us-gaap_CostOfServicesMaintenanceCosts
Total cost of sales	76,336us-gaap_CostOfRevenue	71,202us-gaap_CostOfRevenue
Gross profit	213,177us-gaap_GrossProfit	213,472us-gaap_GrossProfit
Operating expenses:
Sales and marketing	109,553us-gaap_SellingAndMarketingExpense	111,916us-gaap_SellingAndMarketingExpense
Research and development	60,520us-gaap_ResearchAndDevelopmentExpense	55,259us-gaap_ResearchAndDevelopmentExpense
General and administrative	22,971us-gaap_GeneralAndAdministrativeExpense	22,473us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	193,044us-gaap_OperatingExpenses	189,648us-gaap_OperatingExpenses
Operating income	20,133us-gaap_OperatingIncomeLoss	23,824us-gaap_OperatingIncomeLoss
Other income:
Interest income	353us-gaap_InvestmentIncomeInterest	197us-gaap_InvestmentIncomeInterest
Net foreign exchange (loss) gain	(1,674)	50
Other (loss) income, net	628us-gaap_OtherNonoperatingIncomeExpense	88us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	19,440	24,159
(Benefit from) provision for income taxes	4,436us-gaap_IncomeTaxExpenseBenefit	5,436us-gaap_IncomeTaxExpenseBenefit
Net income	$ 15,004us-gaap_NetIncomeLoss	$ 18,723us-gaap_NetIncomeLoss
Basic earnings per share	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic
Weighted average shares outstanding - basic	128,040	125,973
Diluted earnings per share	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding - diluted	128,676	126,725
Dividends declared per share	$ 0.19	$ 0.15

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