CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - Related Party Transactions (Parenthetical) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues:
Revenues		$ 180,676	$ 184,531	$ 373,219	$ 365,361
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		78,504	76,811	168,080	154,458
Expenses:
Operating expenses	[1]	64,382	65,358	128,836	129,292
Selling, general and administrative	[1]	10,882	10,701	22,656	19,614
Terminalling and storage
Revenues:
Revenues	[1]	22,404	22,375	43,953	44,892
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold	[1]	0	24	0	42
Transportation
Revenues:
Revenues	[1]	53,826	57,676	106,811	115,983
Product Sales
Revenues:
Revenues	[1]	100,373	101,003	214,159	197,532
Specialty products
Revenues:
Revenues	[1]	60,318	67,288	129,623	133,613
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold	[1]	52,270	57,553	112,764	114,783
Sulfur services
Revenues:
Revenues	[1]	40,055	33,715	84,536	63,919
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold	[1]	26,234	19,234	55,316	39,633
Related Party
Revenues:
Revenues		26,581	26,519	53,113	53,798
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		10,464	11,311	19,595	20,895
Expenses:
Operating expenses		27,823	26,501	55,388	52,924
Selling, general and administrative		8,135	8,638	16,027	15,501
Related Party | Terminalling and storage
Revenues:
Revenues		18,221	18,078	35,483	36,627
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		0	24	0	42
Expenses:
Operating expenses		5,942	5,637	11,619	10,965
Related Party | Transportation
Revenues:
Revenues		7,320	8,318	15,290	16,919
Expenses:
Operating expenses		20,498	19,814	40,989	39,587
Related Party | Product Sales
Revenues:
Revenues		1,040	123	2,340	252
Related Party | Specialty products
Revenues:
Revenues		122	89	503	190
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		7,277	8,368	13,287	14,941
Related Party | Sulfur services
Revenues:
Revenues		918	34	1,837	62
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		3,187	2,919	6,308	5,912
Expenses:
Operating expenses		$ 1,383	$ 1,050	$ 2,780	$ 2,372

[1] Related Party Transactions Included Above Three Months EndedSix Months EndedJune 30,June 30,2025202420252024Revenues:*    Terminalling and storage$18,221 $18,078 $35,483 $36,627 Transportation7,320 8,318 15,290 16,919 Product Sales1,040 123 2,340 252 Costs and expenses:*Cost of products sold: (excluding depreciation and amortization)Specialty products7,277 8,368 13,287 14,941 Sulfur services3,187 2,919 6,308 5,912 Terminalling and storage— 24 — 42 Expenses:Operating expenses27,823 26,501 55,388 52,924 Selling, general and administrative8,135 8,638 16,027 15,501