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Transactions with Related Parties (Schedule of Transactions With Related Parties) (Details) - USD ($) $ in Thousands	4 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2018
Sandhill Group Llc
Related Party Transaction [Line Items]
Related party transaction, revenues		$ 1,233	$ 2,820	$ 3,097
Equity investment, ownership percentage					50.00%
Poseidon Oil Pipeline Company
Related Party Transaction [Line Items]
Related party transaction, revenues		12,557	12,357	10,844
Related party transaction, expenses		$ 994	986	1,007
Equity investment, ownership percentage		64.00%
ANSAC
Related Party Transaction [Line Items]
Related party transaction, revenues	$ 124,500	$ 373,606	124,536	0
Related party transaction, expenses	$ 2,200	5,284	2,242	0
CEO
Related Party Transaction [Line Items]
Related party transaction, expenses		$ 660	$ 660	$ 660

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

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