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Related Party Debt - Schedule of Consolidated Related Party Debt Obligations (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Sep. 27, 2016
Dec. 31, 2015
Line Of Credit Facility [Line Items]      
Outstanding borrowing $ 686,000,000   $ 457,600,000
Unamortized debt issuance costs $ (900,000)   (600,000)
Five Year Revolver | Shell Treasury Center West Inc      
Line Of Credit Facility [Line Items]      
Line of credit facility maximum borrowing capacity   $ 760,000,000.0  
Debt instrument term 5 years    
364 Day Revolver | Shell Treasury Center West Inc      
Line Of Credit Facility [Line Items]      
Debt instrument term 364 days    
Five Year Revolver      
Line Of Credit Facility [Line Items]      
Outstanding borrowing $ 686,900,000   320,800,000
Line of credit facility maximum borrowing capacity 760,000,000    
Line of credit, amount available $ 73,100,000    
Interest on unused capacity 0.19%    
364 Day Revolver      
Line Of Credit Facility [Line Items]      
Outstanding borrowing $ 0   137,400,000
Line of credit facility maximum borrowing capacity 180,000,000    
Line of credit, amount available $ 180,000,000    
Interest on unused capacity 0.12%    
Revolving Credit Facility | Zydeco      
Line Of Credit Facility [Line Items]      
Outstanding borrowing $ 0   $ 0
Line of credit facility maximum borrowing capacity 30,000,000    
Line of credit, amount available $ 30,000,000    
Interest on unused capacity 0.23%