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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 165,094us-gaap_CashAndCashEquivalentsAtCarryingValue $ 146,919us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 716us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 661us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Short-term investments 226,729us-gaap_ShortTermInvestments 198,547us-gaap_ShortTermInvestments
Accounts receivable, net 58,436us-gaap_AccountsReceivableNetCurrent 78,633us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets 17,856us-gaap_PrepaidExpenseAndOtherAssetsCurrent 17,669us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax assets, net 14,598us-gaap_DeferredTaxAssetsNetCurrent 19,936us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 483,429us-gaap_AssetsCurrent 462,365us-gaap_AssetsCurrent
Property and equipment, net 75,732us-gaap_PropertyPlantAndEquipmentNet 77,852us-gaap_PropertyPlantAndEquipmentNet
Capitalized software development costs, net 17,691us-gaap_CapitalizedComputerSoftwareNet 13,469us-gaap_CapitalizedComputerSoftwareNet
Deposits and other assets 3,551us-gaap_DepositsAssetsNoncurrent 3,951us-gaap_DepositsAssetsNoncurrent
Deferred tax assets, net 1,462us-gaap_DeferredTaxAssetsNetNoncurrent 1,160us-gaap_DeferredTaxAssetsNetNoncurrent
Total assets 581,865us-gaap_Assets 558,797us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses 28,412us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 35,458us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Accrued compensation and employee benefits 36,122us-gaap_EmployeeRelatedLiabilitiesCurrent 50,588us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued restructuring costs 879us-gaap_RestructuringReserveCurrent 2,284us-gaap_RestructuringReserveCurrent
Deferred revenue and advance payments 131,468us-gaap_DeferredRevenueCurrent 108,413us-gaap_DeferredRevenueCurrent
Deferred tax liabilities 457us-gaap_DeferredTaxLiabilitiesCurrent 557us-gaap_DeferredTaxLiabilitiesCurrent
Total current liabilities 197,338us-gaap_LiabilitiesCurrent 197,300us-gaap_LiabilitiesCurrent
Deferred revenue and advance payments 11,366us-gaap_DeferredRevenueNoncurrent 10,818us-gaap_DeferredRevenueNoncurrent
Other long-term liabilities 21,614us-gaap_OtherLiabilitiesNoncurrent 22,679us-gaap_OtherLiabilitiesNoncurrent
Deferred tax liabilities 3,228us-gaap_DeferredTaxLiabilitiesNoncurrent 3,529us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 233,546us-gaap_Liabilities 234,326us-gaap_Liabilities
Commitments and Contingencies      
Stockholders' Equity    
Preferred stock undesignated, $0.001 par value; 5,000 shares authorized; no shares issued or outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Additional paid-in capital 512,259us-gaap_AdditionalPaidInCapital 506,727us-gaap_AdditionalPaidInCapital
Treasury stock, at cost; 6,405 shares (475,184)us-gaap_TreasuryStockValue (475,184)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss (6,507)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (4,363)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 317,733us-gaap_RetainedEarningsAccumulatedDeficit 297,273us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 348,319us-gaap_StockholdersEquity 324,471us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 581,865us-gaap_LiabilitiesAndStockholdersEquity 558,797us-gaap_LiabilitiesAndStockholdersEquity
Class A    
Stockholders' Equity    
Common stock 16us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 16us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Convertible    
Stockholders' Equity    
Common stock $ 2us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 2us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember