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Related Party Debt - Schedule of Consolidated Related Party Debt Obligations (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Line Of Credit Facility [Line Items]    
Outstanding borrowing $ 458,200,000 $ 0
Five Year Revolver Due on October 2019    
Line Of Credit Facility [Line Items]    
Outstanding borrowing 320,800,000 [1] $ 0
364 Day Revolver Due on March 2017    
Line Of Credit Facility [Line Items]    
Outstanding borrowing [2] 137,400,000  
Zydeco | Revolving Credit Facility    
Line Of Credit Facility [Line Items]    
Outstanding borrowing $ 0  
[1] As of December 31, 2015, availability under the $400.0 million Five-Year Revolver was $79.2 million. We pay interest of 0.19% on the unused capacity of the Five-Year Revolver.
[2] As of December 31, 2015, availability under the $180.0 million 364-Day Revolver was $42.6 million. We pay interest of 0.12% on the unused capacity of the 364-Day Revolver.