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Related Party Transactions - Impact of Related Party Transactions (Details) - 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:        
Cost of products sold 78,504 76,811 168,080 154,458
Operating expenses:        
Operating expenses [1] 64,382 65,358 128,836 129,292
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:        
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:        
Cost of products sold [1] 26,234 19,234 55,316 39,633
Terminalling and storage        
Revenues:        
Revenues [1] 22,404 22,375 43,953 44,892
Cost of products sold:        
Cost of products sold [1] 0 24 0 42
Related Party        
Revenues:        
Revenues 26,581 26,519 53,113 53,798
Cost of products sold:        
Cost of products sold 10,464 11,311 19,595 20,895
Operating expenses:        
Operating expenses 27,823 26,501 55,388 52,924
Selling, general and administrative:        
Selling, general and administrative 8,135 8,638 16,027 15,501
Related Party | Indirect, including overhead allocation        
Selling, general and administrative:        
Selling, general and administrative 3,646 3,540 7,142 7,122
Related Party | Transportation        
Revenues:        
Revenues 7,320 8,318 15,290 16,919
Operating expenses:        
Operating expenses 20,498 19,814 40,989 39,587
Selling, general and administrative:        
Selling, general and administrative 2,112 2,203 4,208 4,030
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:        
Cost of products sold 7,277 8,368 13,287 14,941
Selling, general and administrative:        
Selling, general and administrative 1,086 1,256 2,123 1,992
Related Party | Sulfur services        
Revenues:        
Revenues 918 34 1,837 62
Cost of products sold:        
Cost of products sold 3,187 2,919 6,308 5,912
Operating expenses:        
Operating expenses 1,383 1,050 2,780 2,372
Selling, general and administrative:        
Selling, general and administrative 1,000 1,157 1,960 1,933
Related Party | Terminalling and storage        
Revenues:        
Revenues 18,221 18,078 35,483 36,627
Cost of products sold:        
Cost of products sold 0 24 0 42
Operating expenses:        
Operating expenses 5,942 5,637 11,619 10,965
Selling, general and administrative:        
Selling, general and administrative 291 482 594 424
Related Party | Terminalling And Storage Product        
Revenues:        
Revenues $ 0 $ 0 $ 0 $ 0
[1] Related Party Transactions Included Above
Three Months EndedSix Months Ended
June 30,June 30,
2025202420252024
Revenues:*    
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