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v2.4.1.9

Significant Accounting Policy Other (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Commonwealth Park Property [Member] |
Restricted Cash and Cash Equivalents | $ 20,379 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = cnx_CommonwealthParkPropertyMember
plaza escrow [Domain] |
Restricted Cash and Cash Equivalents | $ 48,294 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementScenarioAxis = cnx_PlazaEscrowDomain

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_StatementScenarioAxis=cnx_CommonwealthParkPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=cnx_PlazaEscrowDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |