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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, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quintana Group [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | $ 0 | $ 0 | $ 21,143 | [1],[2]
Related party transaction, expenses | 0 | 0 | 6,260 | [2]
Chief Executive Officer [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses | 630 | 600 | 600 |
Sandhill [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | 3,060 | 3,076 | 2,905 | [3]
Davison [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | $ 0 | $ 1,293 | $ 1,344 | [1]
Sandhill Group, LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
[1] | Amounts included in discontinued operations for all periods presented.
[2] | The Quintana Group monetized all of its remaining investment in our common units on October 5, 2012. Transactions with the Quintana Group are included in the above table as related party transactions through October 5, 2012.
[3] | We own a 50% interest in Sandhill Group, LLC (or "Sandhill).

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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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