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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share, Basic and Diluted [Line Items]                      
Net income $ 31,217us-gaap_NetIncomeLoss $ 67,815us-gaap_NetIncomeLoss $ 36,744us-gaap_NetIncomeLoss $ (9,753)us-gaap_NetIncomeLoss $ 50,958us-gaap_NetIncomeLoss $ 56,181us-gaap_NetIncomeLoss $ 120,113us-gaap_NetIncomeLoss $ 26,031us-gaap_NetIncomeLoss $ 126,023us-gaap_NetIncomeLoss $ 253,283us-gaap_NetIncomeLoss $ 57,798us-gaap_NetIncomeLoss
Interest on convertible subordinated debentures (net of income tax benefit)                 0us-gaap_InterestOnConvertibleDebtNetOfTax 0us-gaap_InterestOnConvertibleDebtNetOfTax 517us-gaap_InterestOnConvertibleDebtNetOfTax
Numerator for earnings per common share—assuming dilution                 $ 126,023us-gaap_NetIncomeLossAttributableToParentDiluted $ 253,283us-gaap_NetIncomeLossAttributableToParentDiluted $ 58,315us-gaap_NetIncomeLossAttributableToParentDiluted
Weighted average common shares outstanding (shares)                 74,431,087us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 65,543,895us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 61,258,825us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1]
Effect of dilutive securities: 2015 warrants (shares)                 1,559,646us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 1,184,549us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Denominator for earnings per common share - assuming dilution (shares)                 79,893,600us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 75,040,646us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 65,675,651us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per common share $ 0.41us-gaap_EarningsPerShareBasic $ 0.90us-gaap_EarningsPerShareBasic $ 0.49us-gaap_EarningsPerShareBasic $ (0.13)us-gaap_EarningsPerShareBasic $ 0.73us-gaap_EarningsPerShareBasic $ 0.86us-gaap_EarningsPerShareBasic $ 1.87us-gaap_EarningsPerShareBasic $ 0.41us-gaap_EarningsPerShareBasic $ 1.69us-gaap_EarningsPerShareBasic $ 3.86us-gaap_EarningsPerShareBasic $ 0.94us-gaap_EarningsPerShareBasic
Earnings per common share - assuming dilution $ 0.39us-gaap_EarningsPerShareDiluted $ 0.85us-gaap_EarningsPerShareDiluted $ 0.46us-gaap_EarningsPerShareDiluted $ (0.13)us-gaap_EarningsPerShareDiluted $ 0.64us-gaap_EarningsPerShareDiluted $ 0.75us-gaap_EarningsPerShareDiluted $ 1.71us-gaap_EarningsPerShareDiluted $ 0.38us-gaap_EarningsPerShareDiluted $ 1.58us-gaap_EarningsPerShareDiluted $ 3.38us-gaap_EarningsPerShareDiluted $ 0.89us-gaap_EarningsPerShareDiluted
Stock Options And Deferred Compensation Agreements [Member]                      
Earnings Per Share, Basic and Diluted [Line Items]                      
Effect of dilutive securities: share-based payment agreements (shares)                 1,178,783us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= ael_StockOptionsAndDeferredCompensationAgreementsMember		 1,224,053us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= ael_StockOptionsAndDeferredCompensationAgreementsMember		 553,312us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= ael_StockOptionsAndDeferredCompensationAgreementsMember
Restricted Stock And Restricted Stock Units [Member]                      
Earnings Per Share, Basic and Diluted [Line Items]                      
Effect of dilutive securities: share-based payment agreements (shares)                 66,926us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= ael_RestrictedStockAndRestrictedStockUnitsMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= ael_RestrictedStockAndRestrictedStockUnitsMember		 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ us-gaap_AwardTypeAxis
= ael_RestrictedStockAndRestrictedStockUnitsMember
Convertible Subordinated Debentures [Member]                      
Earnings Per Share, Basic and Diluted [Line Items]                      
Effect of dilutive securities: conversion of debt securities (shares)                 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember		 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember		 1,348,447us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleSubordinatedDebtMember
Convertible Senior Notes [Member]                      
Earnings Per Share, Basic and Diluted [Line Items]                      
Effect of dilutive securities: conversion of debt securities (shares)                 2,657,158us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		 7,088,149us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember		 2,515,067us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
[1] Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.