Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Current:
Federal	$ 174	$ 0		$ 0
State	366	369		314
Total current income tax expense	540	369		314
Deferred:
Federal	882	0		0
State	478	208		(156)
Total deferred income tax expense (benefit)	1,360	208	[1]	(156)	[1]
Total income tax expense	$ 1,900	$ 577	[2]	$ 158	[2]

[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.