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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Sandhill Group Llc [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity investment, ownership percentage |  | 50.00% | 50.00% |  |
Poseidon Oil Pipeline Company [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity investment, ownership percentage |  | 64.00% | 64.00% |  |
Sandhill Group Llc [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues | [1] |  | $ 2,820 | $ 3,097 | $ 3,259
Poseidon Oil Pipeline Company [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues | [2] |  | 12,357 | 10,844 | 4,536
Related party transaction, expenses | [2] |  | 986 | 1,007 | 464
ANSAC [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues |  | $ 124,500 | 124,536 | 0 | 0
Related party transaction, expenses |  | $ 2,200 | 2,242 | 0 | 0
Chief Executive Officer [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, expenses |  |  | $ 660 | $ 660 | $ 690
[1] | We own a 50% interest in Sandhill Group, LLC.
[2] | We own a 64% interest in Poseidon Oil Pipeline Company, LLC.

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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