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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 1,609us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,609us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property, plant and equipment, accumulated depreciation, depletion and amortization $ 8,600,716us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 9,503,524us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Cumulative Preferred Stock, par $ 100us-gaap_PreferredStockParOrStatedValuePerShare $ 100us-gaap_PreferredStockParOrStatedValuePerShare
Cumulative Preferred Stock, authorized 400,000us-gaap_PreferredStockSharesAuthorized 400,000us-gaap_PreferredStockSharesAuthorized
Cumulative Preferred Stock, issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common Stock, par $ 1.00us-gaap_CommonStockParOrStatedValuePerShare $ 1.00us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, authorized 450,000,000us-gaap_CommonStockSharesAuthorized 450,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, issued 195,042,460us-gaap_CommonStockSharesIssued 195,040,149us-gaap_CommonStockSharesIssued
Treasury stock, shares 17,073,445us-gaap_TreasuryStockShares 17,540,636us-gaap_TreasuryStockShares