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Significant Accounting Policies (Details) a in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 03, 2018 USD ($)	May 31, 2018 USD ($)	Dec. 31, 2019 USD ($) a well	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) a well	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items]
Producing Oil Wells | well			151,000		151,000
Impairment of proved and unproved properties			$ 327,400,000	$ 18,650,000	$ 327,400,000	$ 0	$ 137,865,000
Impairment of Unproved Properties and Expirations					119,429,000	0	0
Goodwill impairment test, measurement period			5 years
Impairment of intangible assets					$ 0	$ 18,650,000	$ 0
Company's matching contribution, percentage					6.00%	6.00%	6.00%
Discretionary contributions to the Plan, amount						$ 0	$ 0
Total payment and cost to the Plan					$ 3,460,000	3,205,000	2,866,000
Minimum
Property, Plant and Equipment [Line Items]
Discretionary contributions to the Plan, percentage					1.00%
Maximum
Property, Plant and Equipment [Line Items]
Discretionary contributions to the Plan, percentage					6.00%
Proved Properties
Property, Plant and Equipment [Line Items]
Impairment of proved and unproved properties						0	0
Unproved Properties
Property, Plant and Equipment [Line Items]
Impairment of proved and unproved properties							0
Building and Improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment					10 years
Building and Improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment					45 years
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment					3 years
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment					25 years
Gathering and Transmission | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment					30 years
Gathering and Transmission | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property, plant and equipment					40 years
Knox and Coalfield
Property, Plant and Equipment [Line Items]
Impairment of long-lived assets							137,865,000
Exploration and Production Related Other Costs
Property, Plant and Equipment [Line Items]
Exploration expense					$ 44,380,000	12,033,000	$ 48,074,000
Midstream
Property, Plant and Equipment [Line Items]
Goodwill acquired during period	$ 796,359,000
Other intangible assets	$ 128,781,000
Customer Relationships
Property, Plant and Equipment [Line Items]
Useful life, customer relationship intangible assets					17 years
Customer Relationships | Midstream
Property, Plant and Equipment [Line Items]
Impairment of intangible assets		$ 18,650,000				$ 18,650,000
Useful life, customer relationship intangible assets		17 years
Marcellus Shale | Central Pennsylvania
Property, Plant and Equipment [Line Items]
Producing Oil Wells | well			56		56
Net acres of land | a			51		51
Impairment of proved and unproved properties					$ 327,400,000
Midstream | Operating Segments | Maximum
Property, Plant and Equipment [Line Items]
Percentage of fair value in excess of carrying amount (less than)			10.00%		10.00%

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