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Business Segments
 6 Months Ended
Jun. 30, 2020
Segment Reporting [Abstract]  
Business Segments BUSINESS SEGMENTS
        The Partnership has four reportable segments: terminalling and storage, transportation, sulfur services and natural gas liquids. The Partnership’s reportable segments are strategic business units that offer different products and services. The operating income of these segments is reviewed by the chief operating decision maker to assess performance and make business decisions.

        The accounting policies of the operating segments are the same as those described in Note 2 in the Partnership’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on February 14, 2020. The Partnership evaluates the performance of its reportable segments based on operating income. There is no allocation of administrative expenses or interest expense. 

Three Months Ended June 30, 2020Operating RevenuesIntersegment Revenues EliminationsOperating Revenues after EliminationsDepreciation and AmortizationOperating Income (Loss) after EliminationsCapital Expenditures and Plant Turnaround Costs
Terminalling and storage46,976  (1,542) 45,434  7,272  2,969  3,427  
Transportation35,259  (3,774) 31,485  4,328  (2,078) 772  
Sulfur services33,420  —  33,420  3,131  8,814  1,739  
Natural gas liquids30,300  (1) 30,299  612  2,616  70  
Indirect selling, general and administrative—  —  —  —  (4,361) —  
Total$145,955  $(5,317) $140,638  $15,343  $7,960  $6,008  

Three Months Ended June 30, 2019Operating RevenuesIntersegment Revenues EliminationsOperating Revenues after EliminationsDepreciation and AmortizationOperating Income (Loss) after EliminationsCapital Expenditures and Plant Turnaround Costs
Terminalling and storage54,351  (1,603) 52,748  7,826  4,254  3,668  
Transportation47,233  (5,912) 41,321  3,778  (2,629) 746  
Sulfur services35,856  —  35,856  2,854  7,528  3,273  
Natural gas liquids57,398  —  57,398  629  456  940  
Indirect selling, general and administrative—  —  —  —  (4,599) —  
Total$194,838  $(7,515) $187,323  $15,087  $5,010  $8,627  

Six Months Ended June 30, 2020Operating RevenuesIntersegment Revenues EliminationsOperating Revenues after EliminationsDepreciation and AmortizationOperating Income (Loss) after EliminationsCapital Expenditures and Plant Turnaround Costs
Terminalling and storage$98,110  $(3,268) $94,842  $14,728  $3,727  $7,022  
Transportation80,433  (10,007) 70,426  8,608  (7,099) 4,698  
Sulfur services61,756  (13) 61,743  6,025  22,672  4,874  
Natural gas liquids112,515  (5) 112,510  1,221  12,993  175  
Indirect selling, general and administrative
—  —  —  —  (8,733) —  
Total$352,814  $(13,293) $339,521  $30,582  $23,560  $16,769  
Six Months Ended June 30, 2019Operating RevenuesIntersegment Revenues EliminationsOperating Revenues after EliminationsDepreciation and AmortizationOperating Income (Loss) after EliminationsCapital Expenditures and Plant Turnaround Costs
Terminalling and storage$110,243  $(3,324) $106,919  $15,663  $9,069  $9,013  
Transportation92,419  (13,303) 79,116  7,348  (6,509) 3,207  
Sulfur services67,449  —  67,449  5,722  13,908  5,479  
Natural gas liquids173,872  —  173,872  1,255  7,314  1,227  
Indirect selling, general and administrative
—  —  —  —  (9,166) —  
Total$443,983  $(16,627) $427,356  $29,988  $14,616  $18,926  

        The Partnership's assets by reportable segment as of June 30, 2020 and December 31, 2019, are as follows:
June 30, 2020December 31, 2019
Total assets:  
Terminalling and storage$286,233  $292,136  
Transportation163,951  170,045  
Sulfur services104,113  110,780  
Natural gas liquids62,682  94,195  
Total assets$616,979  $667,156