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Stockholders' Equity and Equity Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Feb. 28, 2015
Stockholders' Equity and Equity Compensation (Details) [Line Items]      
Closing stock price (in dollars per share) $ 18.05us-gaap_SharePrice $ 25.31us-gaap_SharePrice  
Employee Stock Option [Member]      
Stockholders' Equity and Equity Compensation (Details) [Line Items]      
Stock repurchased during period, shares 88,834us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Stock repurchased during period, value $ 1,400,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Stock repurchased during period, net cash value 100,000aegn_StockRepurchasedDuringPeriodNetCashValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Share based compensation expense 100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average recognition period 1 year 4 months 1 day    
Stock Awards [Member]      
Stockholders' Equity and Equity Compensation (Details) [Line Items]      
Share based compensation expense 1,500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= aegn_StockAwardsMember
900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= aegn_StockAwardsMember
 
Unrecognized share based compensation expense 19,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= aegn_StockAwardsMember
   
Weighted average recognition period 2 years 5 months 15 days    
Deferred Stock Units [Member]      
Stockholders' Equity and Equity Compensation (Details) [Line Items]      
Share based compensation expense   0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= aegn_DeferredStockUnitsMember
 
2013 Employee Plan [Member]      
Stockholders' Equity and Equity Compensation (Details) [Line Items]      
Number of shares of common stock reserved for issuance 2,895,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= aegn_A2013EmployeePlanMember
   
Number of shares available for issuance 1,063,530us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= aegn_A2013EmployeePlanMember
   
2011 Director Plan [Member]      
Stockholders' Equity and Equity Compensation (Details) [Line Items]      
Number of shares of common stock reserved for issuance 250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= aegn_A2011DirectorPlanMember
   
Number of shares available for issuance 121,416us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= aegn_A2011DirectorPlanMember
   
Open Market Repurchase Program [Member]      
Stockholders' Equity and Equity Compensation (Details) [Line Items]      
Share repurchase program, authorized amount     20,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= aegn_ThroughTheOpenMarketRepurchaseProgramMember
Stock repurchased during period, shares 320,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= aegn_ThroughTheOpenMarketRepurchaseProgramMember
   
Stock repurchased during period, value 5,700,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= aegn_ThroughTheOpenMarketRepurchaseProgramMember
   
Shares repurchased, average price per share (in Dollars per share) $ 17.95us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= aegn_ThroughTheOpenMarketRepurchaseProgramMember
   
Equity Compensation Programs [Member]      
Stockholders' Equity and Equity Compensation (Details) [Line Items]      
Share repurchase program, authorized amount 10,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= aegn_InConnectionWithEquityCompensationProgramsMember
   
Stock repurchased during period, shares 28,835us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= aegn_InConnectionWithEquityCompensationProgramsMember
   
Stock repurchased during period, value $ 500,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_ShareRepurchaseProgramAxis
= aegn_InConnectionWithEquityCompensationProgramsMember
   
Shares repurchased, average price per share (in Dollars per share) $ 16.80us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= aegn_InConnectionWithEquityCompensationProgramsMember