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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Lawsuit
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies [Abstract]      
Rental expense $ 9,755,000us-gaap_LeaseAndRentalExpense $ 8,281,000us-gaap_LeaseAndRentalExpense $ 8,110,000us-gaap_LeaseAndRentalExpense
Commitments under long-term non-cancelable operating leases [Abstract]      
2015 6,075,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 6,118,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 4,106,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 1,666,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 308,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Estimated expenses and related liabilities for losses incurred not reported to insurance carrier 2,585,000us-gaap_AccruedInsuranceCurrentAndNoncurrent 1,796,000us-gaap_AccruedInsuranceCurrentAndNoncurrent  
Accrued medical claims 1,057,000ae_AccruedMedicalClaims 1,129,000ae_AccruedMedicalClaims  
Minimum annual individual medical claims for stop loss coverage 100,000ae_MinimumAnnualIndividualMedicalClaimsForStopLossCoverage    
Umbrella insurance coverage 2,000,000ae_UmbrellaInsuranceCoverage    
Minimum aggregate medical claims for umbrella insurance coverage for 2014 4,500,000ae_MinimumAggregateMedicalClaimsForUmbrellaInsuranceCoverage    
Minimum aggregate medical claims for umbrella insurance coverage for 2015 4,500,000ae_MinimumAggregateMedicalClaimsForUmbrellaInsuranceCoverageNextCalendarYear    
Number of suits alleging oil and gas production 1ae_NumberOfClaimAllegingOilAndGasProduction    
Total number of lawsuits 3us-gaap_LossContingencyNewClaimsFiledNumber    
Accrued future legal costs $ 500,000us-gaap_LossContingencyAccrualProvision $ 200,000us-gaap_LossContingencyAccrualProvision