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Other Liabilities (Schedule Of Other Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities [Abstract]    
Environmental $ 64,406us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent $ 20,610us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Other 67,471us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent 68,548us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent
Total other liabilities $ 131,877us-gaap_OtherLiabilitiesNoncurrent $ 89,158us-gaap_OtherLiabilitiesNoncurrent