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Related Party (Details) (CONE [Member], USD $)
12 Months Ended
Dec. 31, 2011
Related Party Transaction [Line Items]  
Due from Related Parties, Current $ 8,966
Related Party Transaction, Expenses from Transactions with Related Party 4,267
Related Party Transaction, Revenues from Transactions with Related Party 592
Payments for Other Operating Activities 12,743
CONE Capital Reimbursement [Member]
 
Related Party Transaction [Line Items]  
Due from Related Parties, Current 8,042
Reimbursement for CONE Expenses [Member]
 
Related Party Transaction [Line Items]  
Due from Related Parties, Current 2,009
Reimbursement for Services Provided to Cone [Member]
 
Related Party Transaction [Line Items]  
Due from Related Parties, Current 414
CONE Gathering Fees [Member]
 
Related Party Transaction [Line Items]  
Due to Related Parties, Current $ (1,499)