CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS - Related Party Transactions - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenues		$ 198,883	$ 240,033
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		108,810	152,757
Expenses:
Operating expenses		21,771	22,536
Selling, general and administrative		8,312	8,535
Terminalling and storage
Revenues:
Revenues	[1]	20,474	23,104
Transportation
Revenues:
Revenues	[1]	38,941	37,795
Product Sales
Revenues:
Revenues	[1]	136,553	176,275
Sulfur services
Revenues:
Revenues		25,408	28,734
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold	[1]	15,295	19,696
Terminalling and storage
Revenues:
Revenues		28,934	31,067
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold	[1]	23,680	26,871
Related Party
Expenses:
Operating expenses		21,771	22,536
Related Party | Terminalling and storage
Revenues:
Revenues		15,874	18,972
Related Party | Transportation
Revenues:
Revenues		5,894	5,643
Related Party | Product Sales
Revenues:
Revenues		92	421
Related Party | Sulfur services
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		2,767	2,574
Related Party | Terminalling and storage
Cost of products sold: (excluding depreciation and amortization)
Cost of products sold		$ 5,777	$ 5,909

[1] Related Party Transactions Included Above   Three Months Ended   March 31,   2020   2019 Revenues:*       Terminalling and storage $ 15,874
  $ 18,972
Transportation 5,894
  5,643
Product Sales 92
  421
Costs and expenses:*       Cost of products sold: (excluding depreciation and amortization)       Sulfur services 2,767
  2,574
Terminalling and storage 5,777
  5,909
Expenses:       Operating expenses 21,771
  22,536
Selling, general and administrative 8,312
  8,535