Discontinued Operations, Divestitures, and Assets Held for Sale - Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 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]
Income from discontinued operations, net of income taxes	$ 0	$ 0	$ (180,568)	$ 1,102	$ 1,029	$ 50,443	$ 4,927	$ 7,087	$ (179,466)	$ 63,486	[1],[2]	$ 21,099	[1],[2]
Natural Gas Storage Assets | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues									22,836	52,108		59,360
Total costs and expenses and other, net, excluding depreciation and amortization									(15,360)	(20,703)		(19,940)
Depreciation and amortization									(8,161)	(18,795)		(22,370)
Other operating loss, net									(178,781)	(824)		(82)
Other, net									0	0		3
Income (loss) from discontinued operations before income taxes									(179,466)	11,786		16,971
Income tax expense									0	0		0
Income from discontinued operations, net of income taxes									(179,466)	11,786		16,971
Gain on disposition									178,781
WTLPG | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total costs and expenses and other, net, excluding depreciation and amortization									0	(247)		(186)
Other operating income									0	48,564		0
Equity in earnings									0	3,383		4,314
Income (loss) from discontinued operations before income taxes									0	51,700		4,128
Income tax expense									0	0		0
Income from discontinued operations, net of income taxes									$ 0	$ 51,700		$ 4,128

[1] Financial information has been revised to include results attributable to MTI acquired from Martin Resource Management Corporation. See Note 2 – Significant Accounting Policies and Practices.

[2] Financial information has been revised to include results attributable to MTI acquired from Martin Resource Management Corporation. See Note 2 – Significant Accounting Policies and Practices.