Quarterly report pursuant to Section 13 or 15(d)

Leased Properties and Leases - Significant Leases (Details)

v3.19.3
Leased Properties and Leases - Significant Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Pinedale LGS          
Operating Leased Assets [Line Items]          
Percentage of total leased properties 44.40%   44.40%   44.50%
Percentage of leased property revenue 40.00% 35.70% 39.30% 34.60%  
Variable rent $ 1.4 $ 1.2 $ 3.5 $ 2.8  
Grand Isle Gathering System          
Operating Leased Assets [Line Items]          
Percentage of total leased properties 55.30%   55.30%   55.20%
Percentage of leased property revenue 59.80% 55.30% 60.60% 56.20%  
Portland Terminal Facility          
Operating Leased Assets [Line Items]          
Percentage of total leased properties 0.00%   0.00%   0.00%
Percentage of leased property revenue 0.00% 8.90% 0.00% 9.10%