Annual report pursuant to Section 13 and 15(d)

Leased Properties and Leases - Significant Leases (Details)

v3.20.4
Leased Properties and Leases - Significant Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pinedale LGS      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 0.00% 44.40%  
Percentage of leased property revenue 52.00% 39.20% 35.20%
Lease revenues from variable rent $ 28 $ 4,600 $ 4,300
Grand Isle Gathering System      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 98.00% 55.30%  
Percentage of leased property revenue 47.60% 60.60% 55.90%
Portland Terminal Facility      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 0.00% 0.00%  
Percentage of leased property revenue 0.00% 0.00% 8.80%