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Transactions with Related Parties (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Poseidon Oil Pipeline Company
Related Party Transaction [Line Items]
Due from related parties	$ 3,200		$ 2,400
Related party transaction, revenues	3,165	$ 3,200
Related party transaction, costs and expenses	247	249
ANSAC
Related Party Transaction [Line Items]
Due from related parties	66,194		$ 60,594
Related party transaction, revenues	90,679	90,796
Related party transaction, costs and expenses	1,057	1,778
Management Service | Poseidon Oil Pipeline Company
Related Party Transaction [Line Items]
Related party transaction, revenues	$ 2,200	$ 2,200

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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