Annual report pursuant to Section 13 and 15(d)

Leased Properties and Leases - Significant Leases (Details)

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Leased Properties and Leases - Significant Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pinedale LGS      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 44.40% 44.50%  
Percentage of leased property revenue 39.20% 35.20% 31.20%
Variable rent $ 4,600 $ 4,300 $ 587
Grand Isle Gathering System      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 55.30% 55.20%  
Percentage of leased property revenue 60.60% 55.90% 59.10%
Portland Terminal Facility      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 0.00% 0.00%  
Percentage of leased property revenue 0.00% 8.80% 9.60%