The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 323
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Sandhill [Member]
Related Party Transaction [Line Items]
Related party transaction, revenues	$ 878	$ 913	$ 2,366	$ 2,418
Poseidon Oil Pipeline Company
Related Party Transaction [Line Items]
Related party transaction, revenues	1,979	1,980	5,935	1,980
Related party transaction, expenses	251	241	749	241
Chief Executive Officer
Related Party Transaction [Line Items]
Related party transaction, expenses	$ 165	$ 165	$ 495	$ 525
Sandhill [Member]
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%