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Transactions with Related Parties (Schedule Of Transactions With Related Parties) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Chief Executive Officer [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses | $ 690 | $ 630 | $ 600 |
Sandhill [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | 3,259 | 3,060 | 3,076 | [1]
Davison [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | 0 | 0 | 1,293 | [2]
Poseidon Oil Pipeline Company [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | 3,941 | 0 | 0 | [3]
Related party transaction, expenses | 464 | 0 | 0 | [3]
Deepwater Gateway LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | $ 56 | $ 0 | $ 0 | [4]
Sandhill Group, LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
[1] | We own a 50% interest in Sandhill Group, LL
[2] | (4)Amounts included in discontinued operations for all periods presented.
[3] | (2)We own a 64% interest in Poseidon Oil Pipeline Company, LLC.
[4] | (3)We own a 50% interest in Deepwater Gateway, LLC.

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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=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
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