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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 146,919us-gaap_CashAndCashEquivalentsAtCarryingValue $ 220,171us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 661us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 583us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Short-term investments 198,547us-gaap_ShortTermInvestments 137,198us-gaap_ShortTermInvestments
Accounts receivable, net 78,633us-gaap_AccountsReceivableNetCurrent 86,181us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets 17,669us-gaap_PrepaidExpenseAndOtherAssetsCurrent 14,260us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax assets, net 19,936us-gaap_DeferredTaxAssetsNetCurrent 21,555us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 462,365us-gaap_AssetsCurrent 479,948us-gaap_AssetsCurrent
Property and equipment, net 77,852us-gaap_PropertyPlantAndEquipmentNet 85,445us-gaap_PropertyPlantAndEquipmentNet
Capitalized software development costs, net 13,469us-gaap_CapitalizedComputerSoftwareNet 10,295us-gaap_CapitalizedComputerSoftwareNet
Deposits and other assets 3,951us-gaap_DepositsAssetsNoncurrent 6,622us-gaap_DepositsAssetsNoncurrent
Deferred tax assets, net 1,160us-gaap_DeferredTaxAssetsNetNoncurrent 3,204us-gaap_DeferredTaxAssetsNetNoncurrent
Total assets 558,797us-gaap_Assets 585,514us-gaap_Assets
Current liabilities:    
Accounts payable and accrued expenses 35,458us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 39,946us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Accrued compensation and employee benefits 50,588us-gaap_EmployeeRelatedLiabilitiesCurrent 79,495us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued restructuring costs 2,284us-gaap_RestructuringReserveCurrent 0us-gaap_RestructuringReserveCurrent
Deferred revenue and advance payments 108,413us-gaap_DeferredRevenueCurrent 113,656us-gaap_DeferredRevenueCurrent
Deferred tax liabilities 557us-gaap_DeferredTaxLiabilitiesCurrent 422us-gaap_DeferredTaxLiabilitiesCurrent
Total current liabilities 197,300us-gaap_LiabilitiesCurrent 233,519us-gaap_LiabilitiesCurrent
Deferred revenue and advance payments 10,818us-gaap_DeferredRevenueNoncurrent 8,970us-gaap_DeferredRevenueNoncurrent
Other long-term liabilities 22,679us-gaap_OtherLiabilitiesNoncurrent 25,511us-gaap_OtherLiabilitiesNoncurrent
Deferred tax liabilities 3,529us-gaap_DeferredTaxLiabilitiesNoncurrent 7,188us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 234,326us-gaap_Liabilities 275,188us-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 506,727us-gaap_AdditionalPaidInCapital 494,086us-gaap_AdditionalPaidInCapital
Treasury stock, at cost; 6,405 shares (475,184)us-gaap_TreasuryStockValue (475,184)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss (4,363)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (831)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 297,273us-gaap_RetainedEarningsAccumulatedDeficit 292,238us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 324,471us-gaap_StockholdersEquity 310,326us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 558,797us-gaap_LiabilitiesAndStockholdersEquity 585,514us-gaap_LiabilitiesAndStockholdersEquity
Class A    
Stockholders' Equity    
Common stock 16us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 15us-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