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Transactions with Related Parties (Schedule of Transactions With Related Parties) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2016
Sandhill Group Llc [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity investment, ownership percentage |  | 50.00% |  |  |
Poseidon Oil Pipeline Company [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity investment, ownership percentage |  | 64.00% |  |  |
Deepwater Gateway LLC [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity investment, ownership percentage |  |  | 50.00% |  | 50.00%
Sandhill Group Llc [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues | [1] | $ 3,097 | $ 3,259 | $ 3,060 |
Poseidon Oil Pipeline Company [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues | [2] | 10,844 | 4,536 | 0 |
Related party transaction, expenses | [2] | 1,007 | 464 | 0 |
Deepwater Gateway LLC [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, revenues |  | 7,900 |  |  |
Chief Executive Officer [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction, expenses |  | $ 660 | $ 690 | $ 630 |
[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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