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Long-Term Debt (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Proceeds from (Repayments of) Other Debt $ 235,200us-gaap_ProceedsFromRepaymentsOfOtherDebt    
Proceeds from Issuance of Private Placement 1,600,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement    
Debt, Weighted Average Interest Rate 5.90%us-gaap_DebtWeightedAverageInterestRate    
Debt Instrument, Convertible, Conversion Price $ 1.0275us-gaap_DebtInstrumentConvertibleConversionPrice1    
Long-term Debt   3,241,474us-gaap_LongTermDebt 3,118,920us-gaap_LongTermDebt
Less amounts due in one year   (5,052)us-gaap_LongTermDebtCurrent (2,957)us-gaap_LongTermDebtCurrent
Long-Term Debt   3,236,422us-gaap_LongTermDebtNoncurrent 3,115,963us-gaap_LongTermDebtNoncurrent
Debt and Capital Lease Obligations   7,964us-gaap_DebtAndCapitalLeaseObligations 8,498us-gaap_DebtAndCapitalLeaseObligations
Senior Notes Due April 2017 at 8.00%      
Debt Instrument [Line Items]      
Long-term Debt   0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_SeniorNotes8PercentDueApril2017ParValueMember
1,500,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_SeniorNotes8PercentDueApril2017ParValueMember
Senior notes due April 2020 at 8.25%      
Debt Instrument [Line Items]      
Long-term Debt   1,014,800us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_SeniorNotes825PercentDueApril2020ParValueMemberMember
1,250,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_SeniorNotes825PercentDueApril2020ParValueMemberMember
Senior notes due March 2021 at 6.375%      
Debt Instrument [Line Items]      
Long-term Debt   250,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_SeniorSecuredNotesDueMarch2021ParValueMember
250,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_SeniorSecuredNotesDueMarch2021ParValueMember
Senior Secured Notes Due April 2022 Par Value [Member]      
Debt Instrument [Line Items]      
Long-term Debt 1,856,506us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_SeniorSecuredNotesDueApril2022ParValueMember
   
Baltimore Port Facility revenue bonds in series due September 2025 at 5.75%      
Debt Instrument [Line Items]      
Long-term Debt   102,865us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_BaltimorePortFacilityRevenueBondsInSeries575PercentDueSeptember2025MemberMember
102,865us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_BaltimorePortFacilityRevenueBondsInSeries575PercentDueSeptember2025MemberMember
Advance royalty commitments      
Debt Instrument [Line Items]      
Long-term Debt   13,473us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_AdvanceRoyaltyCommitmentsMember
11,182us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_AdvanceRoyaltyCommitmentsMember
Note due through December 2012 at 6.10%      
Debt Instrument [Line Items]      
Long-term Debt   3,830us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_NoteDueThroughDecember2012At610MemberMember
4,873us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cnx_NoteDueThroughDecember2012At610MemberMember
Additional Funding Agreement Terms [Member]      
Debt Instrument [Line Items]      
Proceeds from Issuance of Private Placement $ 250,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AdditionalFundingAgreementTermsMember