CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS - Related Party Transactions - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Terminalling and storage	$ 20,025	$ 19,704
Marine transportation	3,613	4,325
Natural gas services	0	112
Product Sales	642	1,430
Cost of products sold: (excluding depreciation and amortization)
Natural gas services	4,318	8,894
Sulfur services	4,526	3,675
Terminalling and storage	6,558	5,067
Expenses:
Operating expenses	13,384	16,376
Selling, general and administrative	$ 7,721	$ 7,568