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Long-Term Debt Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (7,614,000)	$ (54,118,000)	$ (2,129,000)
Senior Notes due March 2027 at 7.25%
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500,000,000
Stated rate, debt instrument	7.25%
5.875% Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument, face amount	$ 894,307,000	1,294,307,000
Purchase of outstanding debt	400,000,000	411,375,000	144,318,000
Gain (loss) on extinguishment of debt	$ (7,614,000)	(15,320,000)	(110,000)
Stated rate, debt instrument	5.875%			5.875%
Senior Notes due March 2026
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000
Stated rate, debt instrument	6.50%
Senior Notes due April 2023
Debt Instrument [Line Items]
Purchase of outstanding debt	$ 500,000,000
Gain (loss) on extinguishment of debt		$ (38,798,000)
Stated rate, debt instrument	8.00%
Senior Notes Due April 2020
Debt Instrument [Line Items]
Purchase of outstanding debt			$ 74,470,000
Stated rate, debt instrument			8.25%
Senior Notes Due March 2021
Debt Instrument [Line Items]
Purchase of outstanding debt			$ 20,611,000
Stated rate, debt instrument		6.375%	6.375%
Senior Notes Due April 2020 and Senior Notes Due March 2021
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			$ (2,019,000)
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount					$ 160,000,000
CNXM | Senior Notes due March 2026
Debt Instrument [Line Items]
Debt instrument, face amount		$ 400,000,000
Unamortized bond discount		$ 6,000,000

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

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