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Consolidated Statement of Comprehensive Income Parentheticals (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014
Other Comprehensive Income (Loss), Tax | $ 10,465 us-gaap_OtherComprehensiveIncomeLossTax | $ 53,990 us-gaap_OtherComprehensiveIncomeLossTax | $ 121,484 us-gaap_OtherComprehensiveIncomeLossTax
Adjustment For Actuarially Determined Liabilities [Member] |  |  |
Other Comprehensive Income (Loss), Tax | 56,304 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = cnx_AdjustmentForActuariallyDeterminedLiabilitiesMember | (276,928)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = cnx_AdjustmentForActuariallyDeterminedLiabilitiesMember | (77,871)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = cnx_AdjustmentForActuariallyDeterminedLiabilitiesMember
Cash Flow Hedging [Member] |  |  |
Other Comprehensive Income (Loss), Tax | $ 55,767 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CashFlowHedgingMember | $ (29,407)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CashFlowHedgingMember | $ (73,593)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_CashFlowHedgingMember

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