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Note 3 - Supplemental Balance Sheet Information Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Costs and Estimated Earnings on Uncompleted Contracts [Abstract]    
Costs incurred on uncompleted contracts $ 795,139aegn_CostsIncurredonUncompletedContracts $ 740,403aegn_CostsIncurredonUncompletedContracts
Estimated earnings to date 158,982aegn_EstimatedEarningsonUncompletedContracts 141,413aegn_EstimatedEarningsonUncompletedContracts
Subtotal 954,121aegn_RevenueEarnedonUncompletedContracts 881,816aegn_RevenueEarnedonUncompletedContracts
Less – billings to date (903,098)aegn_BillingstoDate (826,795)aegn_BillingstoDate
Costs and estimated earnings in excess of billings 94,045us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear 79,999us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Billings in excess of costs and estimated earnings (43,022)us-gaap_BillingsInExcessOfCostCurrent (24,978)us-gaap_BillingsInExcessOfCostCurrent
Total $ 51,023us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms $ 55,021us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms