Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ 1,900	$ 577	[1]	$ 158	[1]
Cash paid for income taxes	515	431		799
Income taxes payable	472	445	[2]
Difference between partnership's tax basis and reported amounts	78,649	(121,775)
State
Operating Loss Carryforwards [Line Items]
Income taxes payable	298	445
Texas
Operating Loss Carryforwards [Line Items]
State income taxes	458	369		352
MTI
Operating Loss Carryforwards [Line Items]
State income taxes		0		$ (38)
Income tax expense (benefit)	1,442
Net operating loss carryforwards	73,801
Net operating loss carryforwards, subject to expiration	14,080
Net operating loss carryforwards, not subject to expiration	59,721
MTI | State
Operating Loss Carryforwards [Line Items]
Income taxes refundable	117	127
MTI | Federal
Operating Loss Carryforwards [Line Items]
Income taxes payable	$ 174	$ 0

[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.