Separation and Distribution and Discontinued Operations - Schedule of Results from Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended				10 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Nov. 12, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill						$ 0	$ 798,689	$ 0
Income from discontinued operations after income taxes						0	373,762	471,113
Net income from discontinued operations	$ (38,625)	$ 87,654	$ 94,784	$ (7,461)		$ 0	136,352	121,500
Midstream Business | Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues					$ 388,854			279,422
Transportation and processing					(803,858)			(604,025)
Operation and maintenance					99,671			80,833
Selling, general and administrative					62,702			53,275
Depreciation					160,701			106,574
Impairment of goodwill					267,878		$ 267,900	0
Transaction costs					93,062			85,124
Amortization of intangible assets					36,007			5,540
Other income					51,014			26,610
Interest expense					88,300			34,801
Income from discontinued operations before income taxes					435,405			543,910
Income tax expense					61,643			72,797
Income from discontinued operations after income taxes					373,762			471,113
Less: Net income from discontinued operations attributable to noncontrolling interests					237,410			349,613
Net income from discontinued operations					$ 136,352			$ 121,500