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Accounting Policies Other Non-current Liabilities (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 19, 2011
Other Non-current Liabilities [Abstract]        
Other Deferred Credits, Current       $ 6,000,000
Other Deferred Credits, Noncurrent 2,700,000 4,400,000    
Other Amortization of Deferred Charges 668,000 0 0  
Tank and pipeline inspection liability, non-current 2,700,000 2,900,000    
Deferred Revenue and Credits $ 4,500,000