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Related Party Debt - Schedule of Consolidated Related Party Debt Obligations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 15, 2017
May 10, 2017
Mar. 01, 2017
Sep. 27, 2016
May 23, 2016
Mar. 29, 2016
Nov. 11, 2015
Jun. 29, 2015
May 12, 2015
Nov. 03, 2014
Sep. 30, 2017
Mar. 31, 2016
Sep. 30, 2017
Dec. 31, 2016
Line Of Credit Facility [Line Items]                            
Outstanding borrowing                     $ 1,000,600,000   $ 1,000,600,000 $ 686,000,000
Unamortized debt issuance costs                     $ (1,300,000)   $ (1,300,000) (900,000)
Five Year Fixed Facility, fixed rate, due March 1, 2022 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Debt instrument term                         5 years  
Five Year Revolver, variable rate, due October 31, 2019 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Debt instrument term 5 years         5 years         5 years 5 years 5 years  
364-Day Revolver, variable rate, due March 1, 2017 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Debt instrument term           364 days           364 days 364 days  
Fixed Facility | Five Year Fixed Facility, fixed rate, due March 1, 2022                            
Line Of Credit Facility [Line Items]                            
Outstanding borrowing                     $ 506,900,000   $ 506,900,000 0
Fixed Facility | Five Year Fixed Facility, fixed rate, due March 1, 2022 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Line of credit facility maximum borrowing capacity                     600,000,000.0   $ 600,000,000.0  
Debt instrument term     5 years                   5 years  
Remaining borrowing capacity                     93,100,000   $ 93,100,000  
Revolving Credit Facility | Zydeco Pipeline Company LLC (“Zydeco”)                            
Line Of Credit Facility [Line Items]                            
Outstanding borrowing                     0   0 0
Revolving Credit Facility | Zydeco Pipeline Company LLC (“Zydeco”) | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Line of credit facility maximum borrowing capacity                     30,000,000   30,000,000  
Revolving Credit Facility | Five Year Revolver, variable rate, due October 31, 2019                            
Line Of Credit Facility [Line Items]                            
Outstanding borrowing                     495,000,000   495,000,000 686,900,000
Revolving Credit Facility | Five Year Revolver, variable rate, due October 31, 2019 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Line of credit facility maximum borrowing capacity                   $ 300,000,000.0 760,000,000.0   $ 760,000,000.0  
Debt instrument term       5 years   5 years     5 years 5 years     5 years  
Remaining borrowing capacity                     265,000,000   $ 265,000,000  
Revolving Credit Facility | 364-Day Revolver, variable rate, due March 1, 2017                            
Line Of Credit Facility [Line Items]                            
Outstanding borrowing                     $ 0   $ 0 $ 0
Revolving Credit Facility | 364-Day Revolver, variable rate, due March 1, 2017 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Line of credit facility maximum borrowing capacity             $ 180,000,000.0              
Debt instrument term             364 days 364 days         364 days  
May 2017 Acquisition | Five Year Fixed Facility, fixed rate, due March 1, 2022 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Debt instrument term   5 years                        
May 2017 Acquisition | Five Year Revolver, variable rate, due October 31, 2019 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Debt instrument term   5 years                        
May 2017 Acquisition | Fixed Facility | Five Year Fixed Facility, fixed rate, due March 1, 2022 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Debt instrument term                         5 years  
May 2017 Acquisition | Revolving Credit Facility | Five Year Revolver, variable rate, due October 31, 2019 | Shell Treasury Center West Inc                            
Line Of Credit Facility [Line Items]                            
Debt instrument term   5 years     5 years