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Ceded Reinsurance (Credit Risk by Reinsurer) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Ceded Credit Risk [Line Items]        
Reinsurance recoverable $ 1,340,256us-gaap_ReinsuranceRecoverables $ 1,234,504us-gaap_ReinsuranceRecoverables $ 1,141,110us-gaap_ReinsuranceRecoverables $ 1,002,919us-gaap_ReinsuranceRecoverables
Percentage of total 100.00%us-gaap_ReinsuranceRecoverablesPercentageOfTotal 100.00%us-gaap_ReinsuranceRecoverablesPercentageOfTotal    
Top five reinsurers        
Ceded Credit Risk [Line Items]        
Reinsurance recoverable 727,682us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember		 655,489us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember		    
Percentage of total 54.30%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember		 53.10%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember		    
Top five reinsurers | A plus | Munich Re        
Ceded Credit Risk [Line Items]        
Reinsurance recoverable 285,918us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerCMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		 214,070us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerCMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		    
Percentage of total 21.30%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerCMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		 17.30%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerCMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		    
Top five reinsurers | A plus | Axis Capital        
Ceded Credit Risk [Line Items]        
Reinsurance recoverable 148,371us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerBMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		 143,063us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerBMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		    
Percentage of total 11.10%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerBMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		 11.60%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerBMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		    
Top five reinsurers | A plus | Arch Re        
Ceded Credit Risk [Line Items]        
Reinsurance recoverable 128,421us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsureraMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		 143,037us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsureraMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		    
Percentage of total 9.60%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsureraMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		 11.60%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsureraMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestAPlusRatingMember		    
Top five reinsurers | A | Markel        
Ceded Credit Risk [Line Items]        
Reinsurance recoverable 86,595us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerDMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember		 86,462us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerDMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember		    
Percentage of total 6.50%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerDMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember		 7.00%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerDMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember		    
Top five reinsurers | A | XL Group        
Ceded Credit Risk [Line Items]        
Reinsurance recoverable 78,377us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerEMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember		 68,857us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerEMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember		    
Percentage of total 5.80%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerEMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember		 5.60%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskAxis
= awh_ReinsurerEMember
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskConcentratedCreditRiskMember
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_AMBestARatingMember		    
Other reinsurers' balances        
Ceded Credit Risk [Line Items]        
Reinsurance recoverable $ 612,574us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskNotConcentratedCreditRiskMember		 $ 579,015us-gaap_ReinsuranceRecoverables
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskNotConcentratedCreditRiskMember		    
Percentage of total 45.70%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskNotConcentratedCreditRiskMember		 46.90%us-gaap_ReinsuranceRecoverablesPercentageOfTotal
/ us-gaap_CededCreditRiskRiskClassificationAxis
= us-gaap_CededCreditRiskNotConcentratedCreditRiskMember