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Shareholders' Equity (Schedule Of Share Repurchases) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
May 01, 2014
Stockholders' Equity Note [Abstract]      
Stock Repurchase Program, Authorized Amount     $ 500,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Equity Compensation Plans Treasury Shares Reserved For Future Issuance 3,000,000awh_EquityCompensationPlansTreasurySharesReservedForFutureIssuance    
Shares repurchased, shares 1,271,213us-gaap_TreasuryStockSharesAcquired 2,012,196us-gaap_TreasuryStockSharesAcquired  
Cost of shares repurchased $ 50,949us-gaap_TreasuryStockValueAcquiredCostMethod $ 68,659us-gaap_TreasuryStockValueAcquiredCostMethod  
Shares repurchased, average price per share $ 40.08us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 34.12us-gaap_TreasuryStockAcquiredAverageCostPerShare