Business Segments (Details) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)		Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)		Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reporting units | segment										4
Revenues	$ 241,862	$ 177,900	$ 187,323	$ 240,033	$ 267,175		$ 234,047	$ 227,164	$ 291,718	$ 847,118	$ 1,020,104	[1]	$ 973,386	[1]
Depreciation and Amortization										60,060	61,484	[1],[2]	65,108	[1],[2]
Operating Income (Loss) after Eliminations	18,027	$ 25,461	$ 5,010	$ 9,606	14,309		$ 5,431	$ 4,489	$ 20,828	58,104	45,057	[1]	45,616	[1]
Capital Expenditures and Plant Turnaround Costs										37,923	35,214		45,797
Total Assets [Abstract]
Total assets	667,156				1,073,628	[3]				667,156	1,073,628	[3]
Operating Revenues
Segment Reporting Information [Line Items]
Revenues										877,895	1,054,565		1,008,444
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues										(30,777)	(34,461)		(35,058)
Indirect selling, general, and administrative
Segment Reporting Information [Line Items]
Depreciation and Amortization										0	0		0
Operating Income (Loss) after Eliminations										(17,981)	(17,901)		(17,332)
Capital Expenditures and Plant Turnaround Costs										0	0		0
Terminalling and storage
Segment Reporting Information [Line Items]
Revenues										209,654	241,440		230,035
Depreciation and Amortization										30,952	39,508		45,160
Operating Income (Loss) after Eliminations										16,732	17,540		629
Capital Expenditures and Plant Turnaround Costs										12,987	13,704		29,644
Total Assets [Abstract]
Total assets	292,136				298,784					292,136	298,784
Terminalling and storage | Operating Revenues
Segment Reporting Information [Line Items]
Revenues										216,313	247,840		236,169
Terminalling and storage | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues										(6,659)	(6,400)		(6,134)
Natural gas liquids
Segment Reporting Information [Line Items]
Revenues										366,502	496,007		473,317
Depreciation and Amortization										2,469	2,488		2,546
Operating Income (Loss) after Eliminations										44,020	31,581		34,880
Capital Expenditures and Plant Turnaround Costs										1,870	746		555
Total Assets [Abstract]
Total assets	94,195				512,817					94,195	512,817
Natural gas liquids | Operating Revenues
Segment Reporting Information [Line Items]
Revenues										366,502	496,026		473,548
Natural gas liquids | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues										0	(19)		(231)
Sulfur services
Segment Reporting Information [Line Items]
Revenues										111,340	132,536		134,684
Depreciation and Amortization										11,332	8,485		8,117
Operating Income (Loss) after Eliminations										22,721	27,397		23,205
Capital Expenditures and Plant Turnaround Costs										14,853	4,429		2,611
Total Assets [Abstract]
Total assets	110,780				115,498					110,780	115,498
Sulfur services | Operating Revenues
Segment Reporting Information [Line Items]
Revenues										111,340	132,536		134,684
Sulfur services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues										0	0		0
Transportation revenue
Segment Reporting Information [Line Items]
Revenues										159,622	150,121		135,350
Depreciation and Amortization										15,307	11,003		9,285
Operating Income (Loss) after Eliminations										(7,388)	(13,560)		4,234
Capital Expenditures and Plant Turnaround Costs										8,213	16,335		12,987
Total Assets [Abstract]
Total assets	$ 170,045				$ 146,529					170,045	146,529
Transportation revenue | Operating Revenues
Segment Reporting Information [Line Items]
Revenues										183,740	178,163		164,043
Transportation revenue | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues										(24,118)	(28,042)		(28,693)
One customers | Natural gas liquids | Revenue | Customer concentration risk
Segment Reporting Information [Line Items]
Revenues										$ 112,280	$ 148,103		$ 114,874

[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.

[3] 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.