Divestitures (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	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/loss on sale/exchange of long-lived assets	$ 1,124,400	$ 1,138,287	$ 2,709,976	$ 0
Asset impairment charges			259,300
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/exchange of long-lived assets			$ 2,400,000