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Transactions with Related Parties (Narrative) (Details) - Affiliated Entity - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Poseidon Oil Pipeline Company
Related Party Transaction [Line Items]
Net sales from related party	$ 12,669	$ 12,557	$ 12,357	[1]
Due from related parties	2,400	2,400
Costs charged by related party, included in operating costs	975	994	986	[1]
Poseidon Oil Pipeline Company | Asset Management Arrangement
Related Party Transaction [Line Items]
Net sales from related party	8,900	8,600	8,400
ANSAC
Related Party Transaction [Line Items]
Net sales from related party	367,133	373,606	124,536
Due from related parties	68,075	60,594
Costs charged by related party, included in operating costs	$ 4,446	$ 5,284	$ 2,242
[1] We own a 64% interest in Poseidon Oil Pipeline Company, LLC.

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