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Accounting Policies - Financial Data for Variable Interest Entities - Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Current assets $ 47,633aegn_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets $ 57,046aegn_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets
Non-current assets 41,284aegn_VariableInterestEntityConsolidatedCarryingAmountNoncurrentAssets 43,165aegn_VariableInterestEntityConsolidatedCarryingAmountNoncurrentAssets
Current liabilities 14,664aegn_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities 22,525aegn_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities
Non-current liabilities $ 34,672aegn_VariableInterestEntityConsolidatedCarryingAmountNoncurrentLiabilities $ 36,155aegn_VariableInterestEntityConsolidatedCarryingAmountNoncurrentLiabilities