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Transactions with Related Parties (Schedule of Transactions with Related Parties) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
ANSAC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | $ 31,774 | $ 0 | $ 31,774 | $ 0
Related party transaction, expenses | 454 | 0 | 454 | 0
Sandhill Group LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues |  |  | 2,153 | 2,366
Sandhill [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | 750 | 878 |  |
Poseidon Oil Pipeline Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | 3,170 | 1,979 | 9,236 | 5,935
Related party transaction, expenses | 254 | 251 | 744 | 749
Chief Executive Officer |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses | $ 165 | $ 165 | $ 495 | $ 495
Sandhill Group LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |
Poseidon Oil Pipeline Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage | 64.00% |  | 64.00% |

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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 Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + 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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