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PARENTHETICAL DATA TO THE CONSOLIDATED BALANCE SHEETS (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts $ 1us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Stockholders' Equity:    
Preferred Stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 131,556,573us-gaap_CommonStockSharesIssued 137,533,382us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding 131,481,473us-gaap_CommonStockSharesOutstanding 137,491,906us-gaap_CommonStockSharesOutstanding
Treasury Stock, Shares 75,100us-gaap_TreasuryStockShares 41,476us-gaap_TreasuryStockShares