CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - Related Party Transactions (Parenthetical) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax		$ 184,531	$ 195,636	$ 365,361	$ 440,165
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		76,811	97,249	154,458	237,067
Expenses:
Operating expenses	[1]	65,358	60,737	129,292	123,482
Selling, general and administrative	[1]	10,701	8,447	19,614	19,619
Terminalling and storage
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	22,375	21,684	44,892	42,542
Transportation
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	57,676	54,750	115,983	110,473
Product Sales
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	101,003	115,845	197,532	280,435
Specialty products
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	67,288	78,872	133,613	211,141
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold	[1]	57,553	71,570	114,783	189,565
Sulfur services
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	[1]	33,715	36,973	63,919	69,294
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold	[1]	19,234	25,654	39,633	47,471
Terminalling and storage
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold	[1]	24	25	42	31
Related Party
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax		26,519	32,851	53,798	56,789
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		11,311	10,587	20,895	22,811
Expenses:
Operating expenses		26,501	25,058	52,924	48,885
Selling, general and administrative		8,638	6,556	15,501	15,072
Related Party | Terminalling and storage
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax		18,078	18,077	36,627	35,579
Expenses:
Operating expenses		5,637	5,517	10,965	10,280
Selling, general and administrative				424	228
Related Party | Transportation
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax		8,318	7,277	16,919	12,788
Expenses:
Operating expenses		19,814	17,951	39,587	36,015
Selling, general and administrative		2,203	1,939	4,030	4,202
Related Party | Product Sales
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax		123	7,497	252	8,422
Related Party | Specialty products
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax		89	7,417	190	8,289
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		8,368	7,918	14,941	17,428
Expenses:
Selling, general and administrative		1,256	570	1,992	1,881
Related Party | Sulfur services
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax		34	80	62	133
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		2,919	2,644	5,912	5,352
Expenses:
Operating expenses		1,050	1,590	2,372	2,590
Selling, general and administrative		1,157	439	1,933	1,520
Related Party | Terminalling and storage
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		$ 24	$ 25	$ 42	$ 31

[1] Related Party Transactions Included Above Three Months EndedSix Months EndedJune 30,June 30,2024202320242023Revenues:*    Terminalling and storage$18,078 $18,077 $36,627 $35,579 Transportation8,318 7,277 16,919 12,788 Product Sales123 7,497 252 8,422 Costs and expenses:* Cost of products sold: (excluding depreciation and amortization) Specialty products8,368 7,918 14,941 17,428 Sulfur services2,919 2,644 5,912 5,352 Terminalling and storage24 25 42 31 Expenses:Operating expenses26,501 25,058 52,924 48,885 Selling, general and administrative8,638 6,556 15,501 15,072