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Equity Investments - Narrative (Details)
 1 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 31, 2015
USD ($)
Dec. 31, 2004
USD ($)
Dec. 31, 2016
USD ($)
ft
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]              
Consideration transferred for business sold     $ 1,500,000,000        
Investee losses in excess of investment   $ 8,308,000     $ 10,238,000 $ 8,308,000  
Loss from equity method investments         2,166,000 124,345,000 $ (879,000)
Equity method investment   $ 26,200,000     0 26,200,000  
Sale of ownership interest for cash         $ 25,000,000 $ 0 $ 0
Independence Hub, LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage of ownership interest   20.00%       20.00%  
Water depth (in feet) | ft         8,000    
Impairment charge   $ 343,300,000          
Estimated fair value   0       $ 0  
Asset retirement obligation   42,100,000     $ 52,500,000 42,100,000  
Investee losses in excess of investment   8,300,000     10,200,000 8,300,000  
Loss from equity method investments         $ 2,200,000 74,900,000  
Capitalized interest   $ 3,600,000       $ 3,600,000  
Participation fee       $ 1,000,000      
Deepwater Gateway, L.L.C. [Member]              
Schedule of Equity Method Investments [Line Items]              
Percentage of ownership interest   50.00%       50.00%  
Impairment charge   $ 96,700,000          
Estimated fair value   70,800,000       $ 70,800,000  
Asset retirement obligation   20,800,000       20,800,000  
Loss from equity method investments           49,400,000  
Capitalized interest   1,200,000       1,200,000  
Equity method investment   $ 26,200,000       $ 26,200,000  
Cash distribution $ 1,200,000            
Sale of ownership interest for cash $ 25,000,000