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Employee Benefit Plans (Restricted Stock Units) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
RSUs and performance-based equity awards      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value of vested awards $ 14,366us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 28,836us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 13,947us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Vesting period 4 years    
Rsus Other Than Performance Based Rsus      
Activity:      
Outstanding, beginning of year 143,697us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Granted, shares 454,176us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Forfeited, shares (16,386)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Fully vested, shares (78,981)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Outstanding, end of year 502,506us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Weighted average grant date fair value:      
Outstanding, beginning of year - weighted average grant date fair value $ 21.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Granted - weighted average grant date fair value $ 33.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Forfeited - weighted average grant date fair value $ (31.22)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Vested - weighted average grant date fair value $ (21.76)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Outstanding, end of year - weighted average grant date fair value $ 32.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value 19,055us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Total compensation cost not yet recognized 12,057us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= awh_RsusOtherThanPerformanceBasedRsusMember
   
Compensation cost not yet recognized, period for recognition 1 year 11 months 8 days    
Performance Based Rsus      
Activity:      
Outstanding, beginning of year 804,519us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Granted, shares 166,302us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Additional awards granted due to achievement of performance criteria, shares 104,895awh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalGrantedDueToAchievementOfPerformanceCriteriaInPeriod
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Forfeited, shares (4,635)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Fully vested, shares (454,440)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Outstanding, end of year 616,641us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
804,519us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
 
Weighted average grant date fair value:      
Outstanding, beginning of year - weighted average grant date fair value $ 23.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Granted - weighted average grant date fair value $ 33.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Additional awards granted due to achievement of performance criteria - weighted average grant date fair value $ 20.50awh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalGrantedDueToAchievementOfCriteriaWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Forfeited - weighted average grant date fair value $ (25.20)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Vested - weighted average grant date fair value $ (20.50)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Outstanding, end of year - weighted average grant date fair value $ 27.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
$ 23.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value 23,383us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Total compensation cost not yet recognized $ 5,814us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
   
Compensation cost not yet recognized, period for recognition 1 year 7 months 20 days    
The rate at which performance awards are expensed 100.00%awh_PerformancePeriodPercentage
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
110.00%awh_PerformancePeriodPercentage
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember
135.00%awh_PerformancePeriodPercentage
/ us-gaap_AwardTypeAxis
= awh_PerformanceBasedRsusMember