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Long-Term Debt (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 08, 2018	Mar. 07, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ 23,413,000	$ 36,000	$ 39,048,000	$ (786,000)
Senior Notes due March 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	400,000,000		400,000,000
Senior Notes Due April 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	1,314,307,000		1,314,307,000				$ 1,705,682,000
Repurchase amount on debt instrument	391,375,000		391,375,000
Gain (loss) on extinguishment of debt		36,000	15,635,000	(786,000)
Debt Instrument, Purchase of Outstanding Debt		$ 19,069,000		$ 119,025,000
Senior Notes due April 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	200,000,000		200,000,000				$ 500,000,000
Repurchase amount on debt instrument	300,000,000		300,000,000
Gain (loss) on extinguishment of debt			23,413,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					$ 2,100,000,000	$ 1,500,000,000
CNXM [Member] | Senior Notes due March 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000		$ 400,000,000
Stated rate, debt instrument	6.50%		6.50%
Unamortized bond discount	$ 6,000,000		$ 6,000,000

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