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Funds Held (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effects of Reinsurance [Line Items]      
Funds held $ 724,021us-gaap_FundsHeldUnderReinsuranceAgreementsAsset $ 632,430us-gaap_FundsHeldUnderReinsuranceAgreementsAsset  
Assumed premiums written 938,594us-gaap_AssumedPremiumsWritten 933,754us-gaap_AssumedPremiumsWritten 760,250us-gaap_AssumedPremiumsWritten
Aeolus Capital Management [Member]      
Effects of Reinsurance [Line Items]      
Funds held 708,047us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_CounterpartyNameAxis
= awh_AeolusCapitalManagementMember		 621,567us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
/ us-gaap_CounterpartyNameAxis
= awh_AeolusCapitalManagementMember		  
Assumed premiums written $ 87,275us-gaap_AssumedPremiumsWritten
/ us-gaap_CounterpartyNameAxis
= awh_AeolusCapitalManagementMember		 $ 83,300us-gaap_AssumedPremiumsWritten
/ us-gaap_CounterpartyNameAxis
= awh_AeolusCapitalManagementMember		 $ 34,597us-gaap_AssumedPremiumsWritten
/ us-gaap_CounterpartyNameAxis
= awh_AeolusCapitalManagementMember