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CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - Related Party Transactions (Parentheticals) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenues:    
Revenues $ 244,529 $ 279,201
Cost of products sold: (excluding depreciation and amortization)    
Cost of products sold 139,818 171,582
Expenses:    
Operating expenses 23,827 21,380
Selling, general and administrative 8,516 8,808
Terminalling and storage    
Revenues:    
Revenues [1] 20,858 19,397
Transportation    
Revenues:    
Revenues [1] 55,723 46,710
Product Sales    
Revenues:    
Revenues [1] 164,590 210,010
Specialty products    
Revenues:    
Revenues [1] 132,269 153,971
Cost of products sold: (excluding depreciation and amortization)    
Cost of products sold [1] 117,995 133,792
Sulfur services    
Revenues:    
Revenues [1] 32,321 56,039
Cost of products sold: (excluding depreciation and amortization)    
Cost of products sold [1] 21,817 37,785
Terminalling and storage    
Cost of products sold: (excluding depreciation and amortization)    
Cost of products sold [1] 6 5
Related Party    
Expenses:    
Operating expenses 23,827 21,380
Related Party | Terminalling and storage    
Revenues:    
Revenues 17,502 16,204
Expenses:    
Operating expenses 4,763 4,872
Related Party | Transportation    
Revenues:    
Revenues 5,511 6,288
Expenses:    
Operating expenses 18,064 15,263
Related Party | Product Sales    
Revenues:    
Revenues 925 321
Related Party | Specialty products    
Cost of products sold: (excluding depreciation and amortization)    
Cost of products sold 9,510 9,646
Related Party | Sulfur services    
Cost of products sold: (excluding depreciation and amortization)    
Cost of products sold 2,708 2,676
Expenses:    
Operating expenses 1,000 1,245
Related Party | Terminalling and storage    
Cost of products sold: (excluding depreciation and amortization)    
Cost of products sold $ 6 $ 5
[1] Related Party Transactions Included Above
Three Months Ended
March 31,
20232022
Revenues:*  
Terminalling and storage$17,502 $16,204 
Transportation5,511 6,288 
Product Sales925 321 
Costs and expenses:*
Cost of products sold: (excluding depreciation and amortization)
Specialty products9,510 9,646 
Sulfur services2,708 2,676 
Terminalling and storage6 5 
Expenses:
Operating expenses23,827 21,380 
Selling, general and administrative8,516 8,808