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Accounting Policies Asset Retirement Obligations (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Beginning balance $ 3,087us-gaap_AssetRetirementObligationsNoncurrent [1] $ 3,263us-gaap_AssetRetirementObligationsNoncurrent  
Liabilities settled 0us-gaap_AssetRetirementObligationLiabilitiesSettled (400)us-gaap_AssetRetirementObligationLiabilitiesSettled  
Accretion expense 232us-gaap_AssetRetirementObligationAccretionExpense 224us-gaap_AssetRetirementObligationAccretionExpense [2] 194us-gaap_AssetRetirementObligationAccretionExpense [2]
Ending balance $ 3,319us-gaap_AssetRetirementObligationsNoncurrent $ 3,087us-gaap_AssetRetirementObligationsNoncurrent [1] $ 3,263us-gaap_AssetRetirementObligationsNoncurrent
[1] Includes the historical balances of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.
[2] Adjusted to include the historical cash flows of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.