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Transactions with Related Parties (Schedule Of Transactions With Related Parties) (Details) - USD ($)
$ in Thousands
12 Months Ended
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.