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Business Segments - Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information      
Total revenues $ 1,018,878 $ 882,431 $ 672,142
Depreciation and Amortization 56,280 56,751 61,462
Operating Income (Loss) after Eliminations 51,263 57,280 46,502
Capital Expenditures and Plant Turnaround Costs 31,133 22,929 26,777
Operating Revenues      
Segment Reporting Information      
Total revenues 1,045,657 905,894 696,830
Intersegment Eliminations      
Segment Reporting Information      
Total revenues (26,779) (23,463) (24,688)
Indirect selling, general, and administrative      
Segment Reporting Information      
Depreciation and Amortization 0 0 0
Operating Income (Loss) after Eliminations (16,914) (16,129) (17,909)
Capital Expenditures and Plant Turnaround Costs 0 0 0
Terminalling and storage      
Segment Reporting Information      
Total revenues 222,284 179,032 184,164
Depreciation and Amortization 28,234 28,210 29,489
Operating Income (Loss) after Eliminations 14,893 10,785 22,153
Capital Expenditures and Plant Turnaround Costs 15,807 9,582 11,619
Terminalling and storage | Operating Revenues      
Segment Reporting Information      
Total revenues 228,793 185,629 191,041
Terminalling and storage | Intersegment Eliminations      
Segment Reporting Information      
Total revenues (6,509) (6,597) (6,877)
Natural gas liquids      
Segment Reporting Information      
Total revenues 398,422 414,043 247,479
Depreciation and Amortization 2,380 2,390 2,456
Operating Income (Loss) after Eliminations (1,853) 38,098 22,104
Capital Expenditures and Plant Turnaround Costs 850 537 395
Natural gas liquids | Operating Revenues      
Segment Reporting Information      
Total revenues 398,425 414,043 247,484
Natural gas liquids | Intersegment Eliminations      
Segment Reporting Information      
Total revenues (3) 0 (5)
Sulfur services      
Segment Reporting Information      
Total revenues 179,164 145,042 108,007
Depreciation and Amortization 11,099 10,432 12,012
Operating Income (Loss) after Eliminations 34,146 32,972 36,256
Capital Expenditures and Plant Turnaround Costs 6,857 7,813 7,415
Sulfur services | Operating Revenues      
Segment Reporting Information      
Total revenues 179,164 145,042 108,020
Sulfur services | Intersegment Eliminations      
Segment Reporting Information      
Total revenues 0 0 (13)
Transportation      
Segment Reporting Information      
Total revenues 219,008 144,314 132,492
Depreciation and Amortization 14,567 15,719 17,505
Operating Income (Loss) after Eliminations 20,991 (8,446) (16,102)
Capital Expenditures and Plant Turnaround Costs 7,619 4,997 7,348
Transportation | Operating Revenues      
Segment Reporting Information      
Total revenues 239,275 161,180 150,285
Transportation | Intersegment Eliminations      
Segment Reporting Information      
Total revenues $ (20,267) $ (16,866) $ (17,793)