Divestitures (Details) $ in Thousands, a in Millions				3 Months Ended	12 Months Ended
	Jul. 18, 2018 USD ($) Bcfe mi well a compressor_station	Jun. 19, 2018 USD ($) Bcfe mi well compressor_station	Dec. 28, 2016 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment/loss on sale of long-lived assets					$ 2,709,976	$ 0	$ 0
Asset impairment charges				$ 260,500
Gain on sale of assets					0	$ 0	$ 8,025
Huron and Permian Basin of Texas
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment/loss on sale of long-lived assets					$ 2,400,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration	$ 523,600	$ 56,900
Number of wells sold | well	12,000	970
Reduction in sales volume | Bcfe	0.2	0.02
Number of miles of gathering lines sold | mi	6,400	350
Number of compressors sold | compressor_station	59	26
Number of acres sold | a	2.5
Non-core Marcellus Gathering System
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas property and equipment			$ 75,000
Gain on sale of assets			$ 8,000