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Revolving Credit Facilities (Details)	1 Months Ended		12 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Nov. 30, 2020 USD ($)	Oct. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018
Short-term Debt [Line Items]
Debt instrument, face amount	$ 1,000
Value of proved reserves, percentage to mortgage			85.00%
Value of proved developing producing reserves, percentage to mortgage			85.00%
Federal Funds Open Rate
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			0.50%
Federal Funds Open Rate | CNXM
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			0.50%
One-Month LIBOR
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			1.00%
One-Month LIBOR | CNXM
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			1.00%
One-Month LIBOR | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			0.75%
One-Month LIBOR | Minimum | CNXM
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			0.50%
One-Month LIBOR | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			1.75%
One-Month LIBOR | Maximum | CNXM
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			1.50%
LIBOR | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			1.75%
LIBOR | Minimum | CNXM
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			1.50%
LIBOR | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			2.75%
LIBOR | Maximum | CNXM
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)			2.50%
Senior Notes due in January 2029 | Debt Instrument, Issuance, Period Two
Short-term Debt [Line Items]
Debt instrument, face amount				$ 500,000,000
Stated rate, debt instrument				6.00%
5.875% Senior Notes due 2022
Short-term Debt [Line Items]
Debt instrument, face amount						$ 894,307,000
Stated rate, debt instrument			5.875%			0.00059%		5.875%
5.875% Senior Notes due 2022 | Minimum | CNXM
Short-term Debt [Line Items]
Debt instrument, face amount			$ 150,000,000
5.875% Senior Notes due 2022 | Maximum | CNXM
Short-term Debt [Line Items]
Debt instrument, face amount			150,000,000
Senior Notes due March 2026
Short-term Debt [Line Items]
Debt instrument, face amount			$ 400,000,000			$ 400,000,000
Stated rate, debt instrument			0.065%			0.065%
Revolving Credit Facility
Short-term Debt [Line Items]
Maximum borrowing capacity	1,900,000,000	$ 2,100,000,000		$ 1,775,000,000
Accordion feature, increased commitment		$ 3,000,000,000
Net leverage ratio		3.00
Percentage of aggregate commitments available under credit facility		15.00%
Amount of balance sheet cash that may have on hand	150,000,000
Initial borrowing base	1,900,000,000			$ 1,775,000,000	$ 1,900,000,000
Debt instrument, face amount							$ 160,000,000
Maximum net leverage ratio			4.00
Minimum current ratio			1.00
Borrowings outstanding			$ 160,800,000			$ 661,000,000
Letters of credit outstanding			185,272,000			204,726,000
Borrowings and issuance of letters of credit remaining capacity			1,428,928,000			1,234,274,000
Revolving Credit Facility | CNXM
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 600,000,000
Borrowings outstanding			291,000,000			311,750,000
Letters of credit outstanding			$ 30,000
Increase in available borrowings		250,000,000
Letters of credit, maximum borrowing capacity		$ 100,000,000
Interest coverage ratio			2.50
Current borrowing capacity			$ 308,970,000			$ 288,250,000
Revolving Credit Facility | Minimum | CNXM
Short-term Debt [Line Items]
Maximum net leverage ratio			5.25
Maximum net leverage ratio			4.75
Revolving Credit Facility | Maximum | CNXM
Short-term Debt [Line Items]
Maximum net leverage ratio			5.50
Maximum net leverage ratio			5.25
Secured leverage ratio			3.50
Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 650,000,000

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- Definition

Credit Facility, Debt Covenant, Secured Leverage Ratio

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Credit Facility, Debt Covenant, Total Leverage Ratio

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Debt Instrument, Borrowing Base

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Debt Instrument, Interest Coverage Ratio

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Debt Instrument, Net Leverage Ratio

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- Definition

Interest Ratio per Credit Facility Covenant

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Letters Of Credit, Amount Outstanding

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Letters Of Credit, Maximum Borrowing Capacity

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- Definition

Line Of Credit Facility, Availability Under Credit Facility, Percentage Of Aggregate Commitments

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- Definition

Line Of Credit Facility, Basket For Dividends And Distributions, Annual Limit Of Available Cash

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- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

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Line of Credit Facility, Maximum Borrowing Capacity, Accordion Feature

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- Definition

minimum current ratio per credit facility

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- Definition

Percentage to Mortgage, Value of Proved Developed Producing Reserves

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Percentage to Mortgage, Value of Proved Reserves

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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