Related Party Transactions - Schedule of the Impact of Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating expenses:
Operating expenses	$ 18,368	$ 21,771
Related Party
Revenues:
Revenue from related parties	19,430	21,860
Cost of products sold:
Cost of products sold	7,103	8,544
Operating expenses:
Operating expenses	18,368	21,771
Selling, general and administrative:
Selling, general and administrative	8,680	8,312
Related Party | Indirect, including overhead allocation
Selling, general and administrative:
Selling, general and administrative	3,611	4,188
Related Party | Terminalling and storage
Revenues:
Revenue from related parties	15,306	15,874
Operating expenses:
Operating expenses	4,102	4,575
Selling, general and administrative:
Selling, general and administrative	820	838
Related Party | Transportation
Revenues:
Revenue from related parties	4,010	5,894
Operating expenses:
Operating expenses	13,059	15,553
Selling, general and administrative:
Selling, general and administrative	1,670	1,839
Related Party | Natural gas liquids
Operating expenses:
Operating expenses	464	497
Selling, general and administrative:
Selling, general and administrative	1,808	704
Related Party | Product sales
Revenues:
Revenue from related parties	114	92
Related Party | Sulfur services
Revenues:
Revenue from related parties	30	19
Cost of products sold:
Cost of products sold	2,535	2,767
Operating expenses:
Operating expenses	743	1,146
Selling, general and administrative:
Selling, general and administrative	771	743
Related Party | Terminalling and storage
Revenues:
Revenue from related parties	84	73
Cost of products sold:
Cost of products sold	$ 4,568	$ 5,777