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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues:      
Revenues $ 707,622 $ 797,963 $ 1,018,878
Cost of products sold: (excluding depreciation and amortization)      
Cost of products sold 297,036 389,680 623,306
Expenses:      
Operating expenses [1] 255,586 252,211 251,886
Selling, general and administrative [1] 48,502 40,826 41,812
Depreciation and amortization 50,787 49,895 56,280
Total costs and expenses 651,911 732,612 973,284
Other operating income (loss), net 1,584 1,373 5,669
Operating income 57,295 66,724 51,263
Other income (expense):      
Interest expense, net (57,706) (60,290) (53,665)
Equity in loss of DSM Semichem LLC (624) 0 0
Loss on extinguishment of debt 0 (5,121) 0
Other, net 25 56 (5)
Total other income (expense) (58,305) (65,355) (53,670)
Net income (loss) before taxes (1,010) 1,369 (2,407)
Income tax expense (4,197) (5,918) (7,927)
Net loss (5,207) (4,549) (10,334)
Less general partner's interest in net loss 104 91 207
Less loss allocable to unvested restricted units 25 14 40
Limited partners' interest in net loss $ (5,078) $ (4,444) $ (10,087)
Net loss per unit attributable to limited partners - basic (in dollars per share) $ (0.13) $ (0.11) $ (0.26)
Net loss per unit attributable to limited partners - diluted (in dollars per share) $ (0.13) $ (0.11) $ (0.26)
Weighted average limited partner units - basic (in shares) 38,831,355 38,771,657 38,726,048
Weighted average limited partner units - diluted (in shares) 38,831,355 38,771,657 38,726,048
Terminalling and storage      
Revenues:      
Revenues [1] $ 89,067 $ 86,514 $ 80,193
Transportation      
Revenues:      
Revenues [1] 223,934 223,677 219,008
Sulfur services      
Revenues:      
Revenues 14,572 13,430 12,337
Product sales      
Revenues:      
Revenues [1] 380,049 474,342 707,340
Specialty products      
Revenues:      
Revenues [1] 264,850 346,777 540,513
Cost of products sold: (excluding depreciation and amortization)      
Cost of products sold [1] 228,600 305,903 503,225
Sulfur services      
Revenues:      
Revenues [1] 115,199 127,565 166,827
Cost of products sold: (excluding depreciation and amortization)      
Cost of products sold [1] 68,364 83,702 120,062
Terminalling and storage      
Cost of products sold: (excluding depreciation and amortization)      
Cost of products sold [1] $ 72 $ 75 $ 19
[1] Related Party Transactions Included Above
Year Ended December 31,
 202420232022
Revenues:   
Terminalling and storage$71,799 $72,138 $66,867 
Transportation33,250 29,276 28,393 
Sulfur Services664 — — 
Product sales457 8,767 554 
Costs and expenses:   
Cost of products sold: (excluding depreciation and amortization)   
Specialty products31,789 35,930 39,356 
Sulfur services11,915 11,182 10,717 
          Terminalling and storage72 75 19 
Expenses:   
Operating expenses106,831 100,851 93,630 
Selling, general and administrative39,385 32,021 31,758