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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information      
Total revenues $ 882,431 $ 672,142 $ 847,118
Depreciation and Amortization 56,751 61,462 60,060
Operating Income (Loss) after Eliminations 57,280 46,502 58,104
Capital Expenditures and Plant Turnaround Costs 22,929 26,777 37,923
Operating Revenues      
Segment Reporting Information      
Total revenues 905,894 696,830 877,895
Intersegment Eliminations      
Segment Reporting Information      
Total revenues (23,463) (24,688) (30,777)
Indirect selling, general, and administrative      
Segment Reporting Information      
Depreciation and Amortization 0 0 0
Operating Income (Loss) after Eliminations (16,129) (17,909) (17,981)
Capital Expenditures and Plant Turnaround Costs 0 0 0
Terminalling and storage      
Segment Reporting Information      
Total revenues 179,032 184,164 209,654
Depreciation and Amortization 28,210 29,489 30,952
Operating Income (Loss) after Eliminations 10,785 22,153 16,732
Capital Expenditures and Plant Turnaround Costs 9,582 11,619 12,987
Terminalling and storage | Operating Revenues      
Segment Reporting Information      
Total revenues 185,629 191,041 216,313
Terminalling and storage | Intersegment Eliminations      
Segment Reporting Information      
Total revenues (6,597) (6,877) (6,659)
Natural gas liquids      
Segment Reporting Information      
Total revenues 414,043 247,479 366,502
Depreciation and Amortization 2,390 2,456 2,469
Operating Income (Loss) after Eliminations 38,098 22,104 44,020
Capital Expenditures and Plant Turnaround Costs 537 395 1,870
Natural gas liquids | Operating Revenues      
Segment Reporting Information      
Total revenues 414,043 247,484 366,502
Natural gas liquids | Intersegment Eliminations      
Segment Reporting Information      
Total revenues 0 (5) 0
Sulfur services      
Segment Reporting Information      
Total revenues 145,042 108,007 111,340
Depreciation and Amortization 10,432 12,012 11,332
Operating Income (Loss) after Eliminations 32,972 36,256 22,721
Capital Expenditures and Plant Turnaround Costs 7,813 7,415 14,853
Sulfur services | Operating Revenues      
Segment Reporting Information      
Total revenues 145,042 108,020 111,340
Sulfur services | Intersegment Eliminations      
Segment Reporting Information      
Total revenues 0 (13) 0
Transportation      
Segment Reporting Information      
Total revenues 144,314 132,492 159,622
Depreciation and Amortization 15,719 17,505 15,307
Operating Income (Loss) after Eliminations (8,446) (16,102) (7,388)
Capital Expenditures and Plant Turnaround Costs 4,997 7,348 8,213
Transportation | Operating Revenues      
Segment Reporting Information      
Total revenues 161,180 150,285 183,740
Transportation | Intersegment Eliminations      
Segment Reporting Information      
Total revenues $ (16,866) $ (17,793) $ (24,118)