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CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues:        
Revenues $ 168,717 $ 170,934 $ 541,936 $ 536,295
Cost of products sold: (excluding depreciation and amortization)        
Cost of products sold 75,743 70,977 243,823 225,435
Expenses:        
Operating expenses [1] 64,882 62,363 193,718 191,655
Selling, general and administrative [1] 9,257 12,494 31,913 32,108
Depreciation and amortization 12,336 12,608 37,790 37,944
Total costs and expenses 162,218 158,442 507,244 487,142
Gain on disposition or sale of property, plant and equipment 395 159 1,487 1,320
Operating income 6,894 12,651 36,179 50,473
Other income (expense):        
Interest expense, net (14,614) (14,592) (43,329) (42,811)
Equity in earnings (loss) of DSM Semichem LLC 20 (314) (805) (314)
Other, net 3 2 19 20
Total other expense (14,591) (14,904) (44,115) (43,105)
Net income before taxes (7,697) (2,253) (7,936) 7,368
Income tax expense (715) (1,066) (3,916) (3,634)
Net income (loss) (8,412) (3,319) (11,852) 3,734
Less general partner's interest in net income (loss) (168) (66) (237) 75
Less income (loss) allocable to unvested restricted units (35) (14) (49) 14
Limited partners' interest in net income (loss) $ (8,209) $ (3,239) $ (11,566) $ 3,645
Net income (loss) per unit attributable to limited partners - basic (in dollars per share) $ (0.21) $ (0.08) $ (0.30) $ 0.09
Net income (loss) per unit attributable to limited partners - diluted (in dollars per share) $ (0.21) $ (0.08) $ (0.30) $ 0.09
Weighted average limited partner units - basic (in shares) 38,892,348 38,832,222 38,889,260 38,831,064
Weighted average limited partner units - diluted (in shares) 38,892,348 38,832,222 38,889,260 38,909,976
Transportation        
Revenues:        
Revenues [1] $ 49,709 $ 56,506 $ 156,520 $ 172,489
Sulfur services        
Revenues:        
Revenues 4,073 3,477 12,369 10,431
Product sales        
Revenues:        
Revenues [1] 91,005 88,389 305,164 285,921
Specialty products        
Revenues:        
Revenues [1] 62,443 67,206 192,066 200,819
Cost of products sold: (excluding depreciation and amortization)        
Cost of products sold [1] 54,844 58,409 167,608 173,192
Sulfur services        
Revenues:        
Revenues [1] 28,562 21,183 113,098 85,102
Cost of products sold: (excluding depreciation and amortization)        
Cost of products sold [1] 20,899 12,545 76,215 52,178
Terminalling and storage        
Revenues:        
Revenues [1] 23,930 22,562 67,883 67,454
Cost of products sold: (excluding depreciation and amortization)        
Cost of products sold [1] $ 0 $ 23 $ 0 $ 65
[1] Related Party Transactions Included Above
Three Months EndedNine Months Ended
September 30,September 30,
2025202420252024
Revenues:*    
Terminalling and storage$18,622 $17,785 $54,105 $54,412 
Transportation6,521 7,975 21,811 24,894 
Product Sales947 91 3,287 343 
Costs and expenses:*
Cost of products sold: (excluding depreciation and amortization)
Specialty products7,973 8,401 21,260 23,342 
Sulfur services3,303 3,014 9,611 8,926 
Terminalling and storage— 23 — 65 
Expenses:
Operating expenses27,857 26,153 83,245 79,077 
Selling, general and administrative7,133 12,215 23,160 27,716