Quarterly report pursuant to Section 13 or 15(d)

Leased Properties and Leases (Details)

v3.7.0.1
Leased Properties and Leases (Details)
bbl / d in Thousands, bbl in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
a
bbl / d
facility
tank
leased_property
mi
bbl
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Sale Leaseback Transaction [Line Items]      
Number of significant leased properties | leased_property 3    
Minimum [Member]      
Sale Leaseback Transaction [Line Items]      
Initial Lease Term 11 years    
Maximum [Member]      
Sale Leaseback Transaction [Line Items]      
Initial Lease Term 15 years    
Grand Isle Gathering System [Member]      
Sale Leaseback Transaction [Line Items]      
Initial Lease Term 11 years    
Length of offshore pipeline (in miles) | mi 153    
Pipeline capacity (in bbl/day) | bbl / d 120    
Number of acres in the onshore terminal and saltwater disposal system (in acres) | a 16    
Renewal Option 9 years    
Renewal Term, percentage of remaining useful life 75.00%    
Initial Estimated Useful Life 27 years    
Grand Isle Gathering System [Member] | Forecast [Member]      
Sale Leaseback Transaction [Line Items]      
Current Monthly Rent Payments   $ 2,854,667 $ 2,826,250
Pinedale Liquids Gathering System [Member]      
Sale Leaseback Transaction [Line Items]      
Initial Lease Term 15 years    
Length of offshore pipeline (in miles) | mi 150    
Number of storage facilities | facility 4    
Renewal Option 5 years    
Current Monthly Rent Payments $ 1,741,933    
Initial Estimated Useful Life 26 years    
Pinedale Liquids Gathering System [Member] | Prudential [Member] | Limited Partner [Member]      
Sale Leaseback Transaction [Line Items]      
Ownership percentage 18.95%    
Pinedale Liquids Gathering System [Member] | Pinedale LP [Member] | General Partner [Member]      
Sale Leaseback Transaction [Line Items]      
Ownership percentage 81.05%    
Portland Terminal Facility [Member]      
Sale Leaseback Transaction [Line Items]      
Initial Lease Term 15 years    
Acres owned (in acres) | a 39    
Number of tanks | tank 84    
Crude oil and petroleum product storage capacity (in bbl) | bbl 1.5    
Renewal Option 5 years    
Current Monthly Rent Payments $ 513,355    
Initial Estimated Useful Life 30 years