v3.26.1
Related Party Transactions - Schedule of Impact of Related Party Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenues:        
Revenues $ 213,600 $ 180,676 $ 401,274 $ 373,219
Cost of products sold:        
Cost of products sold 107,589 78,504 197,088 168,080
Operating expenses:        
Operating expenses [1] 68,947 64,382 135,753 128,836
Selling, general and administrative:        
Selling, general and administrative [1] 9,407 10,882 20,219 22,656
Terminalling and storage        
Revenues:        
Revenues [1] 23,743 22,404 46,180 43,953
Transportation        
Revenues:        
Revenues [1] 56,639 53,826 109,446 106,811
Product sales        
Revenues:        
Revenues [1] 128,965 100,373 237,021 214,159
Specialty products        
Revenues:        
Revenues [1] 83,148 60,318 144,754 129,623
Cost of products sold:        
Cost of products sold [1] 73,907 52,270 126,821 112,764
Sulfur services        
Revenues:        
Revenues [1] 45,817 40,055 92,267 84,536
Cost of products sold:        
Cost of products sold [1] 33,682 26,234 70,267 55,316
Related Party        
Revenues:        
Revenues 27,682 26,581 55,464 53,113
Cost of products sold:        
Cost of products sold 13,455 10,464 24,673 19,595
Operating expenses:        
Operating expenses 27,286 27,823 54,582 55,388
Selling, general and administrative:        
Selling, general and administrative 7,753 8,135 16,020 16,027
Related Party | Indirect, including overhead allocation        
Selling, general and administrative:        
Selling, general and administrative 3,375 3,646 6,734 7,142
Related Party | Terminalling and storage        
Revenues:        
Revenues 18,982 18,221 37,738 35,483
Operating expenses:        
Operating expenses 6,264 5,942 12,236 11,619
Selling, general and administrative:        
Selling, general and administrative 152 291 429 594
Related Party | Transportation        
Revenues:        
Revenues 7,883 7,320 15,926 15,290
Operating expenses:        
Operating expenses 19,887 20,498 40,021 40,989
Selling, general and administrative:        
Selling, general and administrative 2,177 2,112 4,458 4,208
Related Party | Product sales        
Revenues:        
Revenues 817 1,040 1,800 2,340
Related Party | Specialty products        
Revenues:        
Revenues 42 122 95 503
Cost of products sold:        
Cost of products sold 10,137 7,277 18,067 13,287
Selling, general and administrative:        
Selling, general and administrative 1,190 1,086 2,573 2,123
Related Party | Sulfur services        
Revenues:        
Revenues 775 918 1,705 1,837
Cost of products sold:        
Cost of products sold 3,318 3,187 6,606 6,308
Operating expenses:        
Operating expenses 1,135 1,383 2,325 2,780
Selling, general and administrative:        
Selling, general and administrative $ 859 $ 1,000 $ 1,826 $ 1,960
[1] Related Party Transactions Included Above
Three Months EndedSix Months Ended
June 30,June 30,
2026202520262025
Revenues:*    
Terminalling and storage$18,982 $18,221 $37,738 $35,483 
Transportation7,883 7,320 15,926 15,290 
Product Sales817 1,040 1,800 2,340 
Costs and expenses:*
Cost of products sold: (excluding depreciation and amortization)
Specialty products10,137 7,277 18,067 13,287 
Sulfur services3,318 3,187 6,606 6,308 
Expenses:
Operating expenses27,286 27,823 54,582 55,388 
Selling, general and administrative7,753 8,135 16,020 16,027