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Stock-Based Compensation (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, shares authorized (shares)     100,000,000us-gaap_CommonStockSharesAuthorized    
Annual vesting percentage     25.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage    
Expiration period     10 years    
Capitalized Amount     $ 600,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount $ 400,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount $ 200,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
Allocated stock-based compensation expense 7,922,000us-gaap_AllocatedShareBasedCompensationExpense 6,452,000us-gaap_AllocatedShareBasedCompensationExpense 7,867,000us-gaap_AllocatedShareBasedCompensationExpense    
Unrecognized compensation expense related to granted but unvested stock options     9,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Unrecognized compensation cost, period for recognition     2 years 8 months 8 days    
Number of options vested and expected to vest 40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber   31,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber 40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber 40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Weighted average grant date fair value of shares granted     $ 13.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 14.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 12.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Fair value of shares vested 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue   7,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue 800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
Restricted stock expense     2,600,000us-gaap_RestrictedStockExpense 2,500,000us-gaap_RestrictedStockExpense 2,800,000us-gaap_RestrictedStockExpense
Shares of unvested restricted stock 135,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber   10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 135,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 135,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost, period for recognition     1 year 8 months 5 days    
Termination          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period     90 days    
Death, Disability, or Retirement          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period     365 days    
Employee Stock Option | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate Intrinsic Value     2,622,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [1] 11,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [1] 11,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 [1]
Allocated stock-based compensation expense     4,300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 3,900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 2,900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Number of options vested and expected to vest     4,795,880us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
Non-Employee Option Grants          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= elgx_NonEmployeeOptionGrantsMember		    
Non-Employee Option Grants | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated stock-based compensation expense     100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= elgx_NonEmployeeOptionGrantsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember		 800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= elgx_NonEmployeeOptionGrantsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember		 900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= elgx_NonEmployeeOptionGrantsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     306,119us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2]    
Weighted average grant date fair value of shares granted     $ 13.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Shares of unvested restricted stock     672,307us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2] 947,594us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [2]  
2006 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, shares authorized (shares)     11,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember		    
Shares available for grant under the plan     600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember		    
2006 Stock Incentive Plan | Employee Stock Option | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Estimated forfeiture rate     14.00%elgx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEstimatedForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 15.00%elgx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEstimatedForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 30.00%elgx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEstimatedForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
2006 Stock Incentive Plan | Employee Stock Option | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Option exercise price as a percentage of grant date fair value     100.00%elgx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisePricePercentageOfFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= us-gaap_StockCompensationPlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant under the plan     200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= elgx_EmployeeStockPurchasePlanMember		    
Employee Stock Purchase Plan | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense related to granted but unvested stock options 759,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= elgx_EmployeeStockPurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		   841,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= elgx_EmployeeStockPurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 750,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= elgx_EmployeeStockPurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 759,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= elgx_EmployeeStockPurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Employee Stock Purchase Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense related to granted but unvested stock options     $ 3,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= elgx_EmployeeStockPurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember		    
Employee Stock Purchase Plan | Employee Stock | Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Discount from market price     15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= elgx_EmployeeStockPurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		    
[1] Represents the total difference between the Company's stock price at the time of exercise and the stock option exercise price, multiplied by the number of options exercised.
[2] Shares granted in 2014 include 133,628 performance stock units that have certain performance conditions required to be achieved to vest.