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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues:      
Total revenues $ 1,018,878 $ 882,431 $ 672,142
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) 623,306 533,098 356,926
Expenses:      
Operating expenses [1] 251,886 193,952 183,747
Selling, general and administrative [1] 41,812 41,012 40,900
Depreciation and amortization 56,280 56,751 61,462
Total costs and expenses 973,284 824,813 643,035
Other operating income (loss), net 5,669 (534) 12,488
Gain on involuntary conversion of property, plant and equipment 0 196 4,907
Operating income 51,263 57,280 46,502
Other income (expense):      
Interest expense, net (53,665) (54,107) (46,210)
Gain on retirement of senior unsecured notes 0 0 3,484
Loss on exchange of senior unsecured notes 0 0 (8,817)
Other, net (5) (4) 6
Total other income (expense) (53,670) (54,111) (51,537)
Net income (loss) before taxes (2,407) 3,169 (5,035)
Income tax expense (7,927) (3,380) (1,736)
Net loss (10,334) (211) (6,771)
Less general partner's interest in net loss 207 4 135
Less loss allocable to unvested restricted units 40 0 21
Limited partners' interest in net loss $ (10,087) $ (207) $ (6,615)
Net loss per unit attributable to limited partners - basic (in dollars per share) $ (0.26) $ (0.01) $ (0.17)
Net loss per unit attributable to limited partners - diluted (in dollars per share) $ (0.26) $ (0.01) $ (0.17)
Weighted average limited partner units - diluted (in shares) 38,726,048 38,689,041 38,656,559
Basic weighted average limited partner units outstanding (in shares) 38,726,048 38,689,041 38,656,559
Terminalling and storage      
Revenues:      
Total revenues [1] $ 80,268 $ 75,223 $ 80,864
Transportation      
Revenues:      
Total revenues [1] 219,008 144,314 132,492
Sulfur services      
Revenues:      
Total revenues 12,337 11,799 11,659
Product sales      
Revenues:      
Total revenues [1] 707,265 651,095 447,127
Natural gas liquids      
Revenues:      
Total revenues [1] 398,422 414,043 247,479
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) [1] 389,504 362,706 215,895
Sulfur services      
Revenues:      
Total revenues [1] 166,827 133,243 96,348
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) [1] 120,062 89,134 58,515
Terminalling and storage      
Revenues:      
Total revenues [1] 142,016 103,809 103,300
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) [1] $ 113,740 $ 81,258 $ 82,516
[1] Related Party Transactions Included Above
Year Ended December 31,
 202220212020
Revenues:   
Terminalling and storage$66,867 $62,677 $63,823 
Transportation28,393 20,046 21,997 
Product sales554 479 317 
Costs and expenses:   
Cost of products sold: (excluding depreciation and amortization)   
Sulfur services10,717 9,980 10,519 
          Terminalling and storage39,375 27,866 18,429 
Expenses:   
Operating expenses93,630 78,607 80,075 
Selling, general and administrative31,758 32,924 32,886