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Related Party (Details) (CONE [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]      
Due from Related Parties, Current $ 5,448,000 $ 3,142,000  
Related Party Transaction, Expenses from Transactions with Related Party 34,062,000 20,408,000 4,267,000
CONE Capital Reimbursement [Member]
     
Related Party Transaction [Line Items]      
Due from Related Parties, Current 0 (18,000)  
Reimbursement for CONE Expenses [Member]
     
Related Party Transaction [Line Items]      
Due from Related Parties, Current (2,168,000) (1,336,000)  
Reimbursement for Services Provided to Cone [Member]
     
Related Party Transaction [Line Items]      
Due from Related Parties, Current (265,000) (341,000)  
CONE Gathering Fees [Member]
     
Related Party Transaction [Line Items]      
Due to Related Parties, Current $ 7,881,000 $ 4,837,000