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Accounts Receivable Securitization (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Letters of credit, maximum borrowing capacity $ 125,000,000cnx_LettersOfCredit    
Letters of Credit Outstanding, Amount 60,230,000us-gaap_LettersOfCreditOutstandingAmount 66,054,000us-gaap_LettersOfCreditOutstandingAmount  
Subordinated Debt 17,570,000us-gaap_SubordinatedDebt 48,945us-gaap_SubordinatedDebt  
Costs associated with the receivables facility (892,000)cnx_FinancingRelatedFees (1,737,000)cnx_FinancingRelatedFees (1,723,000)cnx_FinancingRelatedFees
Eligible accounts receivable 77,800,000us-gaap_SecuritizedAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding 115,000,000us-gaap_SecuritizedAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding  
Decrease in the accounts receivable securitization program   $ 37,846,000us-gaap_IncreaseDecreaseInAccountsReceivableFromSecuritization  
AR securitization facility [Member]      
Expiration date of receivables facility Mar. 30, 2015