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Unaudited Condensed Consolidated Statements Of Shareholders' Equity (USD $)
In Thousands
Total
Common shares
Treasury shares
Retained earnings
Balance, at beginning of period at Dec. 31, 2013 $ 3,519,826us-gaap_StockholdersEquity $ 418,988us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (79,992)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 3,180,830us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net income 176,972us-gaap_NetIncomeLoss     176,972us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends (16,489)us-gaap_Dividends     (16,489)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Stock compensation 5,028awh_StockCompensation   11,236awh_StockCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(6,208)awh_StockCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Share repurchases (68,659)us-gaap_TreasuryStockValueAcquiredCostMethod   (68,659)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
 
Shares cancelled 0us-gaap_TreasuryStockRetiredCostMethodAmount (8,168)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
68,659us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(60,491)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, at end of period at Mar. 31, 2014 3,616,678us-gaap_StockholdersEquity 410,820us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(68,756)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
3,274,614us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, at beginning of period at Dec. 31, 2014 3,778,291us-gaap_StockholdersEquity 408,020us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(143,075)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
3,513,346us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net income 124,356us-gaap_NetIncomeLoss     124,356us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends (21,522)us-gaap_Dividends     (21,522)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Stock compensation (1,109)awh_StockCompensation   12,288awh_StockCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(13,397)awh_StockCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Share repurchases (50,949)us-gaap_TreasuryStockValueAcquiredCostMethod   (50,949)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
 
Shares cancelled 0us-gaap_TreasuryStockRetiredCostMethodAmount (1,932)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
19,380us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
(17,448)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, at end of period at Mar. 31, 2015 $ 3,829,067us-gaap_StockholdersEquity $ 406,088us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (162,356)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 3,585,335us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember