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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 |

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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Details
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