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Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2012
Trade Accounts Receivable [Member]
Sep. 30, 2012
State Reimbursement Funds [Member]
Sep. 30, 2012
Other Receivables [Member]
Sep. 30, 2012
Environmental Receivable [Member]
Dec. 31, 2011
Predecessor [Member]
Dec. 31, 2011
Predecessor [Member]
Trade Accounts Receivable [Member]
Dec. 31, 2011
Predecessor [Member]
State Reimbursement Funds [Member]
Dec. 31, 2011
Predecessor [Member]
Other Receivables [Member]
Dec. 31, 2011
Predecessor [Member]
Environmental Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Accounts receivable, gross, current   $ 16,962 $ 0 $ 202     $ 30,963 $ 61 $ 903  
Accounts receivable, allowance for doubtful accounts 0 0     0 (167) (153)     (14)
Accounts receivables, net 17,164         31,760        
Receivables from affiliates $ 21,025         $ 106,553