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CONSOLIDATED STATEMENTS OF OPERATIONS - (Related Party Transactions) (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues:      
Total revenues $ 882,431 $ 672,142 $ 847,118
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) 533,098 356,926 492,795
Expenses:      
Operating expenses 78,607 80,075 88,194
Selling, general and administrative 32,924 32,886 32,622
Terminalling and storage      
Revenues:      
Total revenues [1] 75,223 80,864 87,397
Transportation      
Revenues:      
Total revenues [1] 144,314 132,492 159,622
Product sales      
Revenues:      
Total revenues [1] 651,095 447,127 588,665
Sulfur services      
Revenues:      
Total revenues [1] 133,243 96,348 99,906
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) [1] 89,134 58,515 65,893
Terminalling and storage      
Revenues:      
Total revenues [1] 103,809 103,300 122,257
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) [1] 81,258 82,516 101,526
Related Party      
Expenses:      
Operating expenses 78,607 80,075 88,194
Related Party | Terminalling and storage      
Revenues:      
Total revenues 62,677 63,823 71,733
Related Party | Transportation      
Revenues:      
Total revenues 20,046 21,997 24,243
Expenses:      
Operating expenses 55,382 55,786 61,376
Related Party | Product sales      
Revenues:      
Total revenues 479 317 931
Related Party | Sulfur services      
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) 9,980 10,519 10,765
Expenses:      
Operating expenses 4,411 4,489 4,810
Related Party | Terminalling and storage      
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) 27,866 18,429 23,859
Expenses:      
Operating expenses $ 16,776 $ 17,797 $ 18,562
[1] Related Party Transactions Included Above
Year Ended December 31,
 202120202019
Revenues:   
Terminalling and storage$62,677 $63,823 $71,733 
Transportation20,046 21,997 24,243 
Product sales479 317 931 
Costs and expenses:   
Cost of products sold: (excluding depreciation and amortization)   
Sulfur services9,980 10,519 10,765 
          Terminalling and storage27,866 18,429 23,859 
Expenses:   
Operating expenses78,607 80,075 88,194 
Selling, general and administrative32,924 32,886 32,622