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Transactions with Related Parties (Schedule of Transactions With Related Parties) (Details) - USD ($)
$ in Thousands
4 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sandhill Group Llc [Member]        
Related Party Transaction [Line Items]        
Equity investment, ownership percentage 50.00% 50.00%    
Poseidon Oil Pipeline Company [Member]        
Related Party Transaction [Line Items]        
Equity investment, ownership percentage 64.00% 64.00%    
Sandhill Group Llc [Member]        
Related Party Transaction [Line Items]        
Related party transaction, revenues [1]   $ 2,820 $ 3,097 $ 3,259
Poseidon Oil Pipeline Company [Member]        
Related Party Transaction [Line Items]        
Related party transaction, revenues [2]   12,357 10,844 4,536
Related party transaction, expenses [2]   986 1,007 464
ANSAC [Member]        
Related Party Transaction [Line Items]        
Related party transaction, revenues $ 124,500 124,536 0 0
Related party transaction, expenses $ 2,200 2,242 0 0
Chief Executive Officer [Member]        
Related Party Transaction [Line Items]        
Related party transaction, expenses   $ 660 $ 660 $ 690
[1] We own a 50% interest in Sandhill Group, LLC.
[2] We own a 64% interest in Poseidon Oil Pipeline Company, LLC.