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Acquisitions and Divestitures - Additional Information 2017 Divestiture (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 04, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Business Divestitures [Line Items]          
Loss from sale of VGS [1]   $ (100,000)   $ (16,200,000) $ (900,000)
Venice Gathering System, L.L.C. [Member] | Not Qualify as Discontinued Operations [Member]          
Business Divestitures [Line Items]          
Subsidiary ownership interest sale percentage 100.00%        
Proceeds from divestiture of businesses $ 400,000        
Loss from sale of VGS $ (16,100,000)   $ (16,100,000)    
Impact on net income from VGS divestiture   $ 0      
Venice Energy Services Company, L.L.C. [Member]          
Business Divestitures [Line Items]          
Ownership interest   76.80%   76.80%  
[1] Comprised primarily of a $16.1 million loss in the first quarter of 2017 due to the reduction in the carrying value of our ownership interest in VGS in connection with the April 4, 2017 sale.