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CONSOLIDATED STATEMENTS OF OPERATIONS - 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 [1] 193,952 183,747 209,313
Selling, General and Administrative Expense [1] 41,012 40,900 41,433
Depreciation and amortization 56,751 61,462 60,060
Total costs and expenses 824,813 643,035 803,601
Other operating income (loss), net (534) 12,488 14,587
Gain on involuntary conversion of property, plant and equipment 196 4,907 0
Operating income 57,280 46,502 58,104
Other income (expense):      
Interest expense, net (54,107) (46,210) (51,690)
Gain on retirement of senior unsecured notes 0 3,484 0
Loss on exchange of senior unsecured notes 0 (8,817) 0
Other, net (4) 6 6
Total other income (expense) (54,111) (51,537) (51,684)
Net income (loss) before taxes 3,169 (5,035) 6,420
Income tax expense (3,380) (1,736) (1,900)
Income (loss) from continuing operations (211) (6,771) 4,520
Loss from discontinued operations, net of income taxes 0 0 (179,466)
Net loss (211) (6,771) (174,946)
Less general partner's interest in net loss 4 135 3,499
Less (income) loss allocable to unvested restricted units 0 21 (41)
Limited partners' interest in net loss (207) (6,615) (171,488)
Terminalling and storage      
Revenues:      
Total revenues [1] 75,223 80,864 87,397
Transportation      
Revenues:      
Total revenues [1] 144,314 132,492 159,622
Sulfur services      
Revenues:      
Total revenues 11,799 11,659 11,434
Product sales      
Revenues:      
Total revenues [1] 651,095 447,127 588,665
Natural gas liquids      
Revenues:      
Total revenues [1] 414,043 247,479 366,502
Cost of products sold: (excluding depreciation and amortization)      
Total cost of products sold (excluding depreciation and amortization) [1] 362,706 215,895 325,376
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
[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